| silly(adjective, slight, ability, foolish, stupid) |
| dizzy(adjective, slang, ability, careless, silly) |
| giddy(adjective, ability, careless, silly, foolish) |
| brainless(adjective, simple, slow, careless, silly) |
| frivolous(adjective, slight, ability, careless, silly) |
| half ass |
| fatuous(adjective, thoughtless) |
| featherbrained(adjective, slight, ability, careless, silly) |
| flighty(adjective, slight, ability, careless, silly) |
| stupid(adjective, simple, careless, indifferent, silly) |
| goofy(adjective, silly, frivolous, dizzy, frothy) |
| scatterbrained(adjective, ability, careless, silly, foolish) |
| foolish(adjective, slight, careless, indifferent, silly) |
| inane(adjective, slight, silly, foolish, stupid) |
| uneducated(adjective, knowledge, ignorant, scatterbrained, untaught) |
| unintelligent(adjective, simple, slight, indifferent, foolish) |
| vacant(adjective, full, thoughtless, expressionless, scatterbrained) |
| vacuous(adjective, careless, indifferent, stupid, full) |
| witless(adjective, careless, indifferent, silly, foolish) |
| dumb(adjective, simple, silly, foolish, stupid) |