| dotty(adjective, crazy, irrational, distracted) |
| enraged(adjective, strong, violent, menacing) |
| eradicative(demoniac, annihilative) |
| erratic(adjective, silly, mad, insane) |
| extirpative(demoniac, annihilative) |
| fell(adjective, strong, violent, menacing, demoniac) |
| feller(adjective, destructive, unglued, demoniac, well-built) |
| feral(adjective, strong, violent, menacing) |
| ferine(demoniac, annihilative) |
| ferocious(adjective, strong, violent, menacing, demoniac) |
| fierce(adjective, destructive, unglued, demoniac, well-built) |
| fiery(adjective, strong, violent, menacing) |
| flaky(adjective, silly, mad, insane) |
| flipped(adjective, silly, mad, insane) |
| flipped out(expression, adjective, silly, mad, insane) |
| follow-the-leader player |
| frantic(adjective, crazy, irrational, distracted, lunatic) |
| freaked out(expression, adjective, silly, mad, insane) |
| frenzied(adjective, crazy, irrational, distracted) |
| fried(adjective, crazy, irrational, distracted) |