| fluctuating |
| fly-by-night(adjective, unreliable, insecure, treacherous, incalculable) |
| fly by night(adjective, unreliable, insecure, treacherous, incalculable) |
| foolhardy(wild, thoughtless, rash, deed, negligent) |
| foul(adjective, dishonest, immoral, rotten, untrustworthy) |
| fraudulent(adjective, dishonest, immoral, rotten, untrustworthy) |
| freakish |
| giddy |
| gone to the dogs(expression, adjective, idiom, dishonest, immoral) |
| heedless(adjective, careless, wild, thoughtless, rash) |
| iffy(adjective, unreliable, insecure, treacherous, incalculable) |
| immoral(loose, dishonest, degenerate, depraved, uncontrolled) |
| imprudent(adjective, careless, wild, thoughtless, rash) |
| impulsive |
| inattentive(wild, thoughtless, rash, negligent, carefree) |
| incalculable(adjective, unreliable, insecure, treacherous) |
| incautious(wild, thoughtless, rash, oblivious, irresponsible) |
| inconsiderate(adjective, careless, wild, thoughtless, rash) |
| inconsistent |
| indecisive |