| A | B |
| indict | charge |
| induce | persuade; bring about; inducement |
| ingenious | clever; resourceful |
| inherent | firmly established by nature or habit |
| innate | inborn |
| innocuous | harmless |
| innovation | change; introduction of something new |
| insipid | lacking in flavor; dull |
| instigate | urge; start; provoke |
| intrepid | fearless |
| inundate | overwhelm; flood; submerge |
| ironic | resulting in an unexpected and contrary outcome |
| laud | praise |
| lethargic | drowsy; dull |
| levity | lack of seriousness; lightness |
| listless | lacking in spirit or energy |