| enthusiastic(intense, violent, hot, nervous, restless) |
| febrile(adjective, intense, violent, hot, fierce) |
| fevered(adjective, intense, violent, hot, fierce) |
| feverish(adjective, keen, intense, violent, hot) |
| fidgety(nervous, emotional, restless, volatile, fiery) |
| fierce(nasty, hot, hostile, restless, fiery) |
| fighting(nasty, determined, hostile, spirited, aggressive) |
| flickering(adjective, intense, violent, hot, fierce) |
| flip(nasty, determined, hostile, spirited, aggressive) |
| flushed(adjective, intense, violent, hot, fierce) |
| fragile(adjective, excitable) |
| fretful(adjective, keen, violent, anxious, eager) |
| galvanic(nervous, emotional, restless, volatile, fiery) |
| got up on wrong side of bed(expression, idiom, irritable, ugly, crabby) |
| have a bone to pick(expression, idiom, nasty, determined, hostile) |
| have chip on shoulder(expression, idiom, nasty, determined, hostile) |
| have it in for(expression, idiom, nasty, determined, hostile) |
| having short fuse(expression, adjective, idiom, keen, violent) |
| headlong(adjective, keen, violent, anxious, eager) |
| highly-strung |