| fast and loose(expression, idiom, wild, thoughtless, rash) |
| fatuitous |
| fatuous |
| favourable(adjective, feature, state, trait) |
| felicitous(adjective, feature, state, trait) |
| floundering(adjective, insignificant, irregular, useless, empty) |
| foolhardy(wild, thoughtless, rash, oblivious, irresponsible) |
| forceless(inferior, inadequate, limited, feeble, useless) |
| forgetful(adjective, indifferent, unsympathetic, inattentive, uninterested) |
| fragile |
| frail |
| free and easy(adjective, feature, state, trait) |
| frisky(adjective, feature, state, trait) |
| gay(adjective, feature, state, trait) |
| glad(adjective, feature, state, trait) |
| gleeful(adjective, feature, state, trait) |
| goalless(adjective, insignificant, irregular, useless, empty) |
| grasshopper |
| haphazard(adjective, insignificant, irregular, empty, senseless) |
| hard-hearted(adjective, indifferent, unsympathetic, inattentive, uninterested) |