| relentless(adjective, strong, severe, difficult, intense) |
| serious(adjective, keen, warm, intense, passionate) |
| sincere(adjective, keen, warm, intense, passionate) |
| stimulated(adjective, strong, difficult, intense, passionate) |
| stirring(adjective, strong, difficult, intense, passionate) |
| strenuous(adjective, difficult, intense, energetic, lively) |
| trenchant(adjective, strong, intense, powerful, deep) |
| trigger-happy |
| uncontrollable(adjective, strong, severe, intense, passionate) |
| unrestrained(adjective, intense, passionate, violent, cruel) |
| uproarious(adjective, strong, passionate, violent, excited) |
| vociferous(adjective, strong, loud, piercing, insistent) |
| abrupt(adjective, keen, violent, violence, anxious) |
| abusive(adjective, violent) |
| acid(adjective, strong, intense, powerful, deep) |
| acrid |
| acrimonious(animated, frenzied, impassioned) |
| active(adjective, strong, energetic, violent, lively) |
| afire(adjective, keen, intense, passionate, violent) |
| aflame(adjective, intense, violent, hot, spirited) |