| A | B |
| immutable | never changing |
| impartial | fair; just; showing no favoritism |
| impassive | without feeling or emotion; insensible |
| imperturbable | not easily excited or disturbed |
| implausible | not having the appearance of truth or reason |
| inadvertent | not done on purpose; careless |
| incipient | in an early stage |
| incisive | keen; penetrating |
| incongruous | inappropriate; out of place |
| incontrovertible | not able to be disputed or denied |