| half-wit |
one who is stupid or foolish. [1/2 definitions] |
| idiocy |
a foolish act or behavior; folly. [1/2 definitions] |
| imbecile |
foolish; stupid; absurd. [1/4 definitions] |
| inept |
not sensible or reasonable; silly; foolish. [1/3 definitions] |
| infatuate |
to cause a foolish and irrational passion or attachment in (someone). [1/2 definitions] |
| insane |
exceptionally foolish or senseless. [1/4 definitions] |
| jackass |
one who behaves in a foolish manner; fool or stupid person. [1/2 definitions] |
| levity |
a lack of seriousness; light, humorous, or foolish behavior or attitude. |
| loony |
(informal) silly; foolish. [1/3 definitions] |
| loudmouthed |
tending to talk in an indiscreet, foolish, or irritating manner. [1/2 definitions] |
| lunacy |
wild and foolish thinking or behavior, or an instance of this. [1/2 definitions] |
| mad |
imprudent or unrealistic; foolish. [1/6 definitions] |
| maunder |
to speak in an aimless or foolish way; babble. [1/2 definitions] |
| monkey business |
(informal) mischievous, frivolous, or foolish behavior. [1/2 definitions] |
| moron |
a very foolish or stupid person. [1/2 definitions] |
| mush1 |
foolish and excessive sentimentality. [1/3 definitions] |
| nincompoop |
a foolish or silly person. |
| ninny |
a silly or foolish person. |
| nitwit |
(informal) a dimwitted, foolish, or stupid person. |
| noddy |
a foolish or stupid person; simpleton. [1/2 definitions] |
| nonsense |
something, or a collection of things, that is meaningless, illogical, foolish, or absurd. [1/4 definitions] |