| enterprising(adjective, keen, bright, intense, energetic) |
| ethereal(adjective, light, slight, easy, thin) |
| faint |
| fairy |
| featherweight(adjective, light, slight, easy, thin) |
| feathery(adjective, light, slight, easy, thin) |
| filmy(adjective, light, slight, easy, thin) |
| flashing(hot, quick, rapid, speedy, brisk) |
| flexibleness |
| floatable(adjective, light, slight, easy, thin) |
| floating(adjective, light, slight, easy, thin) |
| flowing |
| fluffy(adjective, light, slight, easy, thin) |
| fluid |
| foxy(smart, bright, fast, intelligent, skillful) |
| free |
| frisky(adjective, keen, bright, intense, energetic) |
| frolicsome(adjective, bright, energetic, lively, active) |
| frothy(adjective, light, slight, easy, thin) |
| full of pep(expression, adjective, idiom, bright, energetic) |