| Scrabble Word | Definition |
| illegitimate15 | Not conforming to known principles, or established or accepted rules or standards. |
| inarticulate14 | (of speech) not articulated in normal words (Can we add an example for this sense?) |
| incapacitate18 | To make someone or something incapable of doing something; to disable. |
| indoctrinate15 | To teach with a biased, one-sided or uncritical ideology; to brainwash. |
| inoperculate16 | (zoology) Having no operculum; said of certain gastropod shells. |
| inspectorate16 | An organized group of inspectors. |
| intermediate15 | Being between two extremes, or in the middle of a range. |
| interpellate14 | (obsolete) To interrupt (someone) so as to inform or question (that person about something). |
| invertebrate17 | An animal without vertebrae, i.e. backbone. |
| Scrabble Word | Definition |
| imperforate18 | Not perforated. |
| impersonate15 | (transitive) To pretend to be (a different person); to assume the identity of. |
| importunate15 | (of a demand) Persistent or pressing, often annoyingly so. |
| incarcerate15 | To lock away; to imprison, especially for breaking the law. |
| incorporate15 | (transitive) To include (something) as a part. |
| incriminate15 | (transitive) To accuse or bring criminal charges against. |
| individuate16 | (transitive) To make, or cause to appear, individual. |
| ingurgitate13 | To swallow greedily or in large amounts. |
| instantiate11 | (transitive) To represent (something) by a concrete instance. [from 20th c.] |
| intemperate15 | Lacking moderation, temper or control. |
| intercalate13 | To insert an extra leap day into a calendar in order to maintain synchrony with natural phenomena. |
| interpolate13 | (transitive, intransitive) To introduce (something) between other things; especially to insert (possibly spurious) words into a text. |
| interrelate11 | (transitive, intransitive) To form relationships between multiple things. |
| interrogate12 | (transitive) to question or quiz, especially in a thorough and/or aggressive manner |
| investigate15 | (transitive) To inquire into or study in order to ascertain facts or information. |
| involucrate16 | (botany) Having an involucre; involucred. |
| Scrabble Word | Definition |
| ignimbrite15 | (geology) A deposit left by the pyroclastic flow from a volcano, consisting of ash, pumice lapilli, and lithic fragments. [from 20th c.] |
| illiterate10 | Unable to read and write. |
| illuminate12 | (transitive) To shine light on something. |
| illustrate10 | (obsolete) To shed light upon. |
| immaculate16 | Having no stain or blemish; spotless, undefiled, clear, clean, pure. |
| immoderate15 | Not moderate; excessive. |
| impregnate15 | (transitive) To cause to become pregnant. |
| inaccurate14 | Mistaken or incorrect; not accurate. |
| inactivate15 | (transitive) To make inactive. |
| inadequate20 | Not adequate; not fit for the purpose |
| inapposite14 | inappropriate, not suitable for the situation |
| inaugurate11 | (transitive) To induct into office with a formal ceremony. |
| incinerate12 | (transitive) to destroy by burning |
| incomplete16 | Not complete; not finished |
| indefinite14 | Without limit; forever, or until further notice; not definite. |
| indelicate13 | Improper or immodest. |
| infiltrate13 | (transitive, intransitive) To surreptitiously penetrate, enter or gain access to. |
| ingratiate11 | (reflexive) To bring oneself into favour with someone by flattering or trying to please him or her. |
| innominate12 | Having no name; anonymous. |
| innumerate12 | Lacking numeracy. |
| Scrabble Word | Definition |
| ichnolite14 | A fossil footprint; an ichnite. |
| illuviate12 | (geology) To leach from an overlying stratum and accumulate in suspension. |
| imbricate15 | Having regular overlapping edges; intertwined. |
| immediate14 | Happening right away, instantly, with no delay. |
| immigrate14 | (intransitive) To move into a foreign country to stay permanently. |
| impetrate13 | (transitive) To obtain by asking; to procure upon request. |
| implicate15 | (transitive, with “in”) To show to be connected or involved in an unfavorable or criminal way. |
| imprecate15 | (transitive) To call down by prayer, as something hurtful or calamitous. |
| inanimate11 | Lacking the quality or ability of motion; as an inanimate object. |
| incarnate11 | (postpositive) Embodied in flesh; given a bodily, especially a human, form; personified. |
| incondite12 | Badly-arranged, ill-composed, disorderly (especially of artistic works). |
| inculcate13 | (transitive) To teach by repeated instruction. |
| inculpate13 | (law) To imply the guilt of; to blame or incriminate. |
| incurvate14 | bending inwards. |
| indusiate10 | (botany) Furnished with an indusium. |
| inebriate11 | A person who is intoxicated, especially one who is habitually drunk. |
| infatuate12 | (transitive) To inspire with unreasoning love, attachment or enthusiasm. |
| infuriate12 | To make furious or mad with anger; to fill with fury. |
| infuscate14 | (transitive) To darken; to make black or obscure. |
| innervate12 | (anatomy, zoology) To supply (an organ or part of the body) with nerves. |
| Scrabble Word | Definition |
| ilmenite10 | (mineralogy) A weakly magnetic dark gray mineral found in metamorphic and igneous rocks; it is a mixed oxide of iron and titanium, FeTiO3 |
| immolate12 | To kill as a sacrifice. |
| impolite12 | Not polite; not of polished manners; wanting in good manners. |
| inchoate13 | Recently started but not fully formed yet; just begun; only elementary or immature. |
| increate10 | That exists without having been created. |
| incubate12 | (transitive) To brood, raise, or maintain eggs, organisms, or living tissue through the provision of ideal environmental conditions. |
| incudate11 | (zoology, anatomy) Of, pertaining to or having an incus (bone of the middle ear). |
| indagate10 | (transitive) to search into, investigate |
| indicate11 | To point out; to discover; to direct to a knowledge of; to show; to make known. |
| indurate9 | To harden or to grow hard. |
| infinite11 | Indefinably large, countlessly great; immense. [from 14th c.] |
| initiate8 | A new member of an organization. |
| innovate11 | (obsolete, transitive) To alter, to change into something new; to revolutionize. |
| insolate8 | (transitive) To dry in, or expose to, the sun's rays; to ripen or prepare by such exposure. |
| insulate8 | To separate, detach, or isolate. |
| intimate10 | Closely acquainted; familiar. |
| intonate8 | (transitive, intransitive, dated) To intone or recite (words), especially emphatically or in a chanting manner. |
| intubate10 | (transitive, medicine) To insert a tube into. |
| inundate9 | To cover with large amounts of water; to flood. |
| invocate13 | To invoke or implore |
| Scrabble Word | Definition |
| ichnite12 | A fossilized footprint or track of an animal. |
| imamate11 | (Islam) The office or jurisdiction of an imam. |
| imbrute11 | To make brutal |
| imitate9 | To follow as a model or a pattern; to make a copy, counterpart or semblance of. |
| impaste11 | (transitive, archaic) To knead; to make into paste; to concrete. |
| infante10 | (historical) Any son of the king of Spain or Portugal, except the eldest or heir apparent. |
| inflate10 | (transitive) To enlarge an object by pushing air (or a gas) into it; to raise or expand abnormally |
| ingrate8 | (obsolete, poetic) ungrateful |
| inosite7 | Former name of inositol. |
| instate7 | (transitive) To install (someone) in office; to establish. |
| isolate7 | (transitive) To set apart or cut off from others. |
| iterate7 | (computing) to perform or repeat an action on each item in a set |
| Scrabble Word | Definition |
| ideate7 | To apprehend in thought so as to fix and hold in the mind; to memorize. |
| ignite7 | (transitive) to set fire to (something), to light (something) |
| illite6 | (mineralogy) A micaceous phyllosilicate clay mineral with aggregates of grey or white monoclinic crystals. |
| impute10 | (transitive) To attribute or ascribe (responsibility or fault) to a cause or source. |
| incite8 | (transitive) To stir up or excite; to rouse or goad into action. |
| indite7 | (transitive) To physically make letters and words on a writing surface; to inscribe. |
| ingate7 | (obsolete) entrance; ingress |
| inmate8 | A person confined to an institution such as a prison (as a convict) or hospital (as a patient). |
| innate6 | Inborn; existing or having existed since birth. |
| invite9 | (transitive) To ask for the presence or participation of someone or something. |
| iodate7 | (chemistry) The anion IO3-; Any salt of iodic acid. |
| iolite6 | (gemology) The clear variety of cordierite, sometimes used as a gem. |