| dippy(adjective, light, silly, stupid, crazy) |
| cockamamy(adjective, frivolous, dizzy, frothy, flighty) |
| half ass |
| dizzy(adjective, frivolous, frothy, flighty, featherbrained) |
| loony(adjective, light, foolish, stupid, crazy) |
| fatuous(adjective, silly, foolish, fantastic, unwise) |
| featherbrained(adjective, frivolous, dizzy, frothy, flighty) |
| inane(adjective, silly, foolish, stupid, fantastic) |
| weird(adjective, strange, silly, foolish, fantastic) |
| daft(adjective, strange, silly, foolish, odd) |
| balmy(adjective, silly, foolish, fantastic, unwise) |
| cuckoo(adjective, silly, foolish, unwise) |
| empty-headed(adjective, silly, frivolous, dizzy, frothy) |
| mad(adjective, silly, foolish, unwise) |
| nuts(noun, adjective, strange, silly, foolish) |
| futile(adjective, frivolous, dizzy, frothy, flighty) |
| giddy(adjective, frivolous, dizzy, frothy, flighty) |
| harebrained(adjective, silly, foolish, fantastic, unwise) |
| light-headed(adjective, frivolous, dizzy, frothy, flighty) |
| light-minded(adjective, frivolous, dizzy, frothy, flighty) |