| fitful(careless, unstable, unreasonable, unpredictable, changeable) |
| flaky(careless, lively, unstable, unreasonable, unpredictable) |
| flighty(careless, lively, unstable, unreasonable, unpredictable) |
| fluctuating(lively, unpredictable, changeable, temperamental) |
| freakish(careless, unstable, unreasonable, unpredictable, changeable) |
| gaga(careless, lively, unstable, unreasonable, changeable) |
| helter-skelter(careless, unstable, unreasonable, unpredictable, changeable) |
| hemming and hawing |
| hesitant |
| humorsome(careless, unstable, unreasonable, unpredictable, changeable) |
| iffy |
| impulsive(careless, lively, unstable, unreasonable, unpredictable) |
| in the middle |
| inconstant(careless, lively, unstable, unreasonable, changeable) |
| indecisive |
| irregular(lively, unpredictable, changeable, temperamental) |
| irrepressible(lively, unpredictable, changeable, temperamental) |
| irresolute |
| kinky(careless, unstable, unreasonable, unpredictable, changeable) |
| lighthearted(lively, unpredictable, changeable, temperamental) |