| featherweight(dull, light, slight, fine, thin) |
| feeling rotten(expression, infirm, poorly) |
| feeling terrible(expression, infirm, poorly) |
| feverish(mean, weak, down, ill, sick) |
| fine(light, keen, sharp, narrow, acute) |
| fleshless(dull, slight, thin, delicate, lifeless) |
| flowered |
| flushed |
| flying light(expression, adjective, thin, pale, hungry) |
| forsaken(shabby, desolate, dilapidated, neglected, ramshackle) |
| fragile(dull, light, slight, fine, thin) |
| frowzy(shabby, desolate, dilapidated, neglected, ramshackle) |
| funny(mean, weak, down, ill, sick) |
| fusiform |
| gangling(dull, light, slight, fine, thin) |
| gangly(dull, light, slight, fine, thin) |
| ghastly(adjective, thin, dim, pale, white) |
| ghostly(adjective, thin, pale, white, wasted) |
| got the bug(expression, idiom, infirm, poorly) |
| ground fine |