| loopy(adjective, knowledge, ability, informal, foolish) |
| meaningless(adjective, dull, simple, slow, silly) |
| mentally retarded(expression, idiom) |
| pointless(adjective, dull, simple, slow, silly) |
| scatterbrained(adjective, simple, slow, silly, foolish) |
| softheaded(adjective, knowledge, ability, foolish) |
| unearthly(adjective, knowledge, ability, foolish) |
| unintellectual(adjective, simple, slow, stupid, innocent) |
| unwise(adjective, weak, simple, silly, foolish) |
| vacant |
| Boeotian |
| addle-brained |
| addled(adjective, simple, slow, stupid, sluggish) |
| apprenticed(adjective, innocent, thick, unfamiliar, unconscious) |
| arrested |
| babbling |
| benighted(adjective, innocent, thick, unfamiliar, unconscious) |
| birdbrained(adjective, foolish, crazy, innocent, vague) |
| bizarre(adjective, impractical, half-baked, doomed) |
| blind to(expression, adjective, innocent, unfamiliar, unconscious) |