| flyaway |
| foolish(adjective, simple, slight, careless, silly) |
| impetuous(adjective, foolish, crazy, unreliable, changeable) |
| inconsistent(adjective, stupid, unstable, unsettled, unreliable) |
| irregular(adjective, lively, unstable, unsettled, unpredictable) |
| light-headed(adjective, silly, faint) |
| lively(adjective, happy, excited, active, cheerful) |
| moody(adjective, careless, unstable, unreasonable, changeable) |
| reckless(adjective, careless, wild, foolish, stupid) |
| restless(adjective, unstable, unsettled, changeable, variable) |
| birdbrained(adjective, slang, ability, fickle, irresponsible) |
| effervescent(adjective, careless, unstable, unreasonable, changeable) |
| ever-changing(adjective, changeable) |
| fleeting(adjective, impulsive, unpredictable, capricious, explosive) |
| flippant(adjective, impulsive, unpredictable, frivolous, playful) |
| gaga(adjective, ability, informal, careless, lively) |
| mutable(adjective, careless, unstable, unreasonable, unsettled) |
| shallow(adjective, slight, silly, foolish, trivial) |
| uncertain(adjective, unstable, unsettled, variable, insanity) |
| unserious |