| ill-considered(adjective, weak, simple, silly, foolish) |
| illiterate(adjective, innocent, thick, unfamiliar, unconscious) |
| in the dark(expression, adjective, idiom, innocent, unfamiliar) |
| incautious(adjective, weak, simple, silly, foolish) |
| incongruous(adjective, silly, stupid, insignificant, unreasonable) |
| inconsistent(adjective, silly, stupid, insignificant, unreasonable) |
| indiscreet(adjective, dull, weak, simple, silly) |
| inexperienced(adjective, innocent, thick, unfamiliar, unconscious) |
| injudicious(adjective, weak, simple, silly, foolish) |
| innocent(adjective, green, thick, unfamiliar, unconscious) |
| insensate(adjective, dull, simple, slow, foolish) |
| insensible(innocent, unfamiliar, unknowing, unaware, uninformed) |
| jackass(adjective, foolish) |
| knuckle-headed(adjective, foolish) |
| kooky(adjective, weak, simple, silly, foolish) |
| lame-brained(adjective, foolish) |
| meat-headed(adjective, foolish) |
| mentally handicapped(expression, silly, foolish, stupid) |
| misinformed(adjective, innocent, thick, unfamiliar, unconscious) |
| mongoloid |