| A | B |
| inanimate | adjective; lifeless; sluggish |
| inarticulate | adjective; unable to speak clearly or to use words |
| incendiary | noun or adjective; a person who sets fire to property; capable of causing fire |
| incentive | noun or adjective; motivation; encouragement; motivating |
| inclement | adjective; rough or stormy; harsh |
| inconsistent | adjective; not in harmony; changeable |
| indestructible | adjective; not capable of being destroyed; unbreakable |
| indict | verb; to charge with an offense or crime |
| indignant | adjective; angered by the unfairness or meanness of something |
| indomitable | adjective; unconquerable; unyielding |