| fickle(adjective, happy, lively, active, cheerful) |
| flaky(lively, unpredictable, changeable, temperamental) |
| flip(lively, unpredictable, changeable, amusing, resilient) |
| fluctuating(lively, unpredictable, changeable, temperamental, resilient) |
| frothy(adjective, ability) |
| full of pep(expression, idiom, pleasant, bright, happy) |
| fun-loving |
| funny(adjective, pleasant, bright, happy, lively) |
| gaga(adjective, ability, informal, lively, unpredictable) |
| gala(adjective, happy, merry, cheerful, joyful) |
| gamesome(keen, happy, wild, lively, spirited) |
| gladsome(pleasant, bright, happy, cheerful, high) |
| go-go(adjective, happy, merry, cheerful, joyful) |
| good-humored(pleasant, bright, happy, cheerful, jolly) |
| good-natured(adjective, pleasant, bright, happy, lively) |
| gratified(happy, cheerful, high, delighted, pleased) |
| grooving(adjective, pleasant, happy, merry, cheerful) |
| happiest |
| happy life |
| harebrained(adjective, ability) |