| A | B |
| incoherent | rambling; not logically connected |
| incongruous | not appropriate |
| incontrovertible | undeniable |
| incorrigible | bad beyond correction |
| increment | an increase |
| incriminate | to connect to a crime |
| incubus | nightmare |
| inculcate | to influence someone to accept an idea |
| incumbent | resting or lying; one who holds a political office |
| in cur | to bring upon oneself |
| incursion | a raid |
| indefatigable | untiring |
| indelible | incapable of being erased |
| indemnify | to repay for a loss |
| indicative | signifying; implying |
| indict | to charge with a crime; to accuse of a wrongdoing |
| indigneous | native to a particular area; inborn |
| indignant | angry as a result of unjust treatmnet |
| indiscriminate | at random |
| indoctrinate | to teach someone a set of beliefs |
| indolence | laziness |
| indomitable | unconquerable |
| indubitable | unquestionable |
| induce | to bring about |
| indulgence | gentle treatment |
| insurrection | uprising |
| intact | left whole |
| intangible | vague or untouchable |
| integral | essential |
| integrate | unify; to bring together |
| integrity | honesty |
| inter | to bury |
| interdict | to prohibit; to block |
| interim | period of time between acts |
| interlocutor | one who takes part in a conversation |
| interloper | an intruder |
| interlude | a period of time between two events |
| interminable | endless |
| intermittent | periodic |
| interpose | to place between |
| intractable | hard to manage |
| intransigent | stubborn |
| intrepid | courageous |
| intrinsic | essential |
| introspective | looking into oneself |