| fanciful(adjective, free, careless, wild, extravagant) |
| fast-and-loose(careless, bold, thoughtless, wary, heedless) |
| favourable(adjective, feature, state, trait) |
| felicitous(adjective, feature, state, trait) |
| fickle(adjective, free, careless, wild, foolish) |
| fiery(careless, thoughtless, impulsive, reckless, hasty) |
| fitful(adjective, free, careless, wild, extravagant) |
| flaccid(soft, tolerant, slack, lenient, remiss) |
| flaky(passionate, violent, thoughtless, abrupt, impetuous) |
| flexible(adjective, calm, mild, relaxed, casual) |
| fluctuating(adjective, free, careless, wild, extravagant) |
| foot-in-mouth(careless, bold, thoughtless, wary, heedless) |
| forgetful(soft, tolerant, slack, lenient, remiss) |
| free(wild, lively, cheerful, jolly, cheery) |
| frenzied(careless, anxious, worried, thoughtless, impulsive) |
| frisky(adjective, feature, state, trait) |
| frivolous(adjective, free, easy, keen, happy) |
| general(soft, tolerant, slack, lenient, remiss) |
| glad(adjective, feature, state, trait) |
| gleeful(adjective, feature, state, trait) |