| light(adjective, happy, wild, silly, foolish) |
| vacillating(adjective, silly, impulsive, changeable, uneven) |
| airheaded(adjective, unreliable, changeable, erratic) |
| goofy(adjective, frivolous, dizzy, frothy, flighty) |
| irresolute(adjective, careless, silly, impulsive, changeable) |
| irresponsible(adjective, careless, silly, stupid, vague) |
| reckless(adjective, easy, careless, wild, silly) |
| unstable(adjective, careless, silly, stupid, doubtful) |
| erratic(adjective, weak, careless, silly, uncertain) |
| foolish(adjective, simple, rough, careless, silly) |
| thoughtless(adjective, careless, silly, immoral, vague) |
| whimsical(adjective, excited, silly, impulsive, unreliable) |
| careless(adjective, easy, wild, silly, loose) |
| harebrained(adjective, ability, careless, excited, silly) |
| lightweight |
| brainless(adjective, simple, careless, silly, foolish) |
| heedless(adjective, careless, wild, silly, stupid) |
| skittish(adjective, silly, nervous, impulsive, caprice) |
| uncertain(adjective, uneven, unbalanced, insanity, unhinged) |
| unserious |