| empty |
| featherbrained(adjective, slight, ability, careless, trivial) |
| feathery(adjective, light, slight, easy, thin) |
| fizzing(noun, adjective, sparkling, bubbly, gassy) |
| flighty(adjective, slight, ability, careless, crazy) |
| fluffy(adjective, light, slight, easy, thin) |
| slender(adjective, light, slight, easy, thin) |
| slight(adjective, light, easy, lower, thin) |
| unimportant(adjective, slight, lower, value, inferior) |
| volatile(sparkling, irresolution, gassy, foaming, fizzing) |
| weightless(adjective, light, slight, easy, thin) |
| barmy(adjective, silly, bubbly) |
| gaga(adjective, ability, informal, careless, inconstant) |
| birdbrained(adjective, slang, ability) |
| futile |
| giddy(adjective, ability, careless, inconstant, irresolution) |
| glittering |
| gossamery(adjective, light, slight, easy, thin) |
| idle |
| lathered(adjective, bubbly, foamy, soapy) |