| erratic(adjective, fervent, rash, zealous, volatile) |
| excitable(adjective, feeling, moving, sensitive, touching) |
| extremely enthusiastic(expression, adjective, keen, intense, energetic) |
| exuberant(adjective, keen, warm, passionate, violent) |
| fanatically |
| fanaticize |
| fanatics |
| far-out(adjective, concern, slang, edge, politics) |
| febrile(excited, agitated, restless) |
| fireball(adjective, keen, passionate, enthusiastic, ardent) |
| fired(adjective, keen, passionate, enthusiastic, ardent) |
| fired up(expression, adjective, keen, intense, energetic) |
| flaming(adjective, ardent, fervent, zealous, avid) |
| flipped(adjective, enthusiastic, ill, sick, fervent) |
| foaming at the mouth(expression, adjective, idiom, enthusiastic, ill) |
| forceful(adjective, strong, great, keen, sharp) |
| fractious(hateful, impatient, conservative, prejudiced, bigoted) |
| freaked out(expression, adjective, enthusiastic, ill, sick) |
| gung-ho(adjective, keen, passionate, enthusiastic, ardent) |
| gung ho(expression, adjective, keen, warm, passionate) |