| A | B |
| intuition | noun; knowing or becoming aware through an inner feeling rather than through reasoning; sharp insight |
| invariably | adverb; continually; perpetually; constantly |
| invincible | adjective; not to be overcome; unconquerable |
| irksome | adjective; annoying; irritating |
| irrational | adjective; illogical; senseless |
| irrelevant | adjective; not applicable; not related to the subject |
| itinerary | noun; a route, plan, or record of a trip |
| jargon | noun; the specialized language of a trade or profession |
| jostle | verb; to shove or push rudely |
| judicious | adjective; showing good judgment |