| extremist(adjective, enthusiastic, sick, fervent) |
| fanatical(adjective, enthusiastic, sick, fervent) |
| flipped(adjective, enthusiastic, sick, fervent) |
| foaming at the mouth(expression, adjective, idiom, enthusiastic) |
| freaked out(expression, adjective, enthusiastic, sick) |
| frenetic(adjective, enthusiastic, sick, fervent) |
| infuriated(adjective, enthusiastic, sick, fervent) |
| insane(adjective, enthusiastic, sick, fervent) |
| intemperate(adjective, enthusiastic, sick, fervent) |
| intolerant(adjective, enthusiastic, sick, fervent) |
| irrational(adjective, enthusiastic, sick, fervent) |
| keen(adjective, enthusiastic, sick, fervent) |
| mad(adjective, enthusiastic, sick, fervent) |
| mad-dog(adjective, enthusiastic, sick, fervent) |
| narrow-minded(adjective, enthusiastic, sick, fervent) |
| nutty(adjective, enthusiastic, sick, fervent) |
| overboard(adjective, enthusiastic, sick, fervent) |
| poisoned(adjective, enthusiastic, sick, fervent) |
| rabid(adjective, sick, angry, unwell) |
| radical(adjective, enthusiastic, sick, fervent) |