| A | B |
| intrepid | adjective; brave or resolute; showing great courage |
| intricacy | noun; elaborateness; the condition or quality of being complex, complicated, or involved |
| intrinsic | adjective; inherent; belonging to a thing by its essential nature |
| introspective | adjective; contemplative; given to the examination of one's own thoughts and feelings |
| inure | verb; to accustom or habituate, usually to something undesirable |
| invidious | adjective; hateful; offensive |
| invoke | verb; to call upon a higher power for assistance; to ask or appeal for |
| irascible | adjective; irritable; easily angered |
| laconic | adjective; concise; using few words |
| laudable | adjective; praiseworthy |