| flaky(careless, unstable, unreasonable, unpredictable, changeable) |
| flighty(careless, unstable, unreasonable, unpredictable, changeable) |
| fluctuating(adjective, free, wild, unreliable, uneven) |
| fragmentary(unreliable, uneven, variable, erratic, random) |
| freakish(careless, unstable, unreasonable, unpredictable, changeable) |
| frivolous(adjective, free, careless, wild, extravagant) |
| from A to Z |
| from side to side(expression, idiom, vacillating, zigzag, variably) |
| gaga(careless, unstable, unreasonable, unpredictable, changeable) |
| heedless(adjective, free, careless, wild, extravagant) |
| helter-skelter(careless, unstable, unreasonable, unpredictable, changeable) |
| high and low(adverb, place, everywhere, anywhere, all-over) |
| hitch and hike(expression, idiom) |
| hot and cold(expression, adjective, idiom, free, careless) |
| humorsome(careless, unstable, unreasonable, unpredictable, changeable) |
| immoderate(free, wild, wanton) |
| impulsive(careless, unstable, unreasonable, unpredictable, changeable) |
| in detail |
| in rotation |
| in turn |