| fiery(adjective, passionate, violent, enthusiastic, fervent) |
| firm(adjective, determined, resolute, obstinate, uncompromising) |
| fixed(adjective, determined, resolute, obstinate, uncompromising) |
| flipped(adjective, enthusiastic, ill, sick, fervent) |
| foaming at the mouth(expression, adjective, idiom, enthusiastic, ill) |
| foul(adjective, cruel, unreasonable, dishonest, immoral) |
| fractious(hateful, impatient, conservative, prejudiced, fanatical) |
| frantic(adjective, enthusiastic, ill, sick, fervent) |
| freaked out(expression, adjective, enthusiastic, ill, sick) |
| frenetic(adjective, enthusiastic, ill, sick, fervent) |
| frenzied(adjective, passionate, violent, enthusiastic, ill) |
| furious(adjective, enthusiastic, ill, sick, fervent) |
| grievous(adjective, cruel, unreasonable, dishonest, immoral) |
| haggard |
| hanging(adjective, determined, resolute, obstinate, uncompromising) |
| hard-headed |
| high on(expression, adjective, passionate, violent, enthusiastic) |
| hot(adjective, enthusiastic, ill, sick, fervent) |
| hyperorthodox |
| immoderate(adjective, passionate, violent, enthusiastic, fervent) |