| buoyant(lively, impulsive, unpredictable, changeable, explosive) |
| convertible(adjective, unstable, unsettled, changeable, variable) |
| coquettish(changeable, indecisive, inconsistent) |
| crazed(adjective, foolish, crazy, irrational, outrageous) |
| daft(crazy, cuckoo, queer) |
| enthusiastic(adjective, foolish, crazy, irrational, imagination) |
| extravagant(adjective, foolish, crazy, irrational, imagination) |
| fanatic(crazy, imagination, cuckoo, queer) |
| feather-brained |
| flexible(adjective, changeable) |
| flip(lively, unpredictable, changeable, frivolous, playful) |
| fluid(adjective, unstable, unsettled, changeable, variable) |
| fly-by-night(adjective, careless, immoral, thoughtless, reckless) |
| freakish(careless, unstable, unreasonable, unpredictable, changeable) |
| gay(adjective, happy, lively, silly, foolish) |
| haphazard(adjective, motiveless) |
| hoity-toity(adjective, pompous) |
| inane(slight, careless, stupid, trivial, absurd) |
| insane(crazy, cuckoo, queer) |
| lighthearted(adjective, ability, happy, lively, silly) |