| frivolous(expression, adjective, feature, state, characteristic) |
| light-hearted(expression, adjective, feature, person, trait) |
| unthinking(adjective, feature, person, trait, thoughtfulness) |
| careless(adjective, feature, person, trait, thoughtfulness) |
| puerile(adjective, trait, young, child, immature) |
| thoughtless(expression, adjective, feature, characteristic, person) |
| neglectful(adjective, feature, person, trait, thoughtfulness) |
| giddy(expression, adjective, feature, state, characteristic) |
| foolish(expression, adjective, feature, state, characteristic) |
| heedless(adjective, feature, person, trait, thoughtfulness) |
| incautious(adjective, feature, person, trait, thoughtfulness) |
| mindless(adjective, feature, person, trait, thoughtfulness) |
| scatterbrained(adjective, feature, person, trait, thoughtfulness) |
| silly(adjective, feature, person, trait, thoughtfulness) |
| light(expression, adjective, feature, state, characteristic) |
| unheeding(adjective, feature, person, trait, thoughtfulness) |
| unmindful(adjective, feature, person, trait, thoughtfulness) |
| flippant(expression, adjective, feature, state, characteristic) |
| frisky(adjective, trait, behavior, cheerful, conduct) |
| immature(adjective, trait, young, child) |