| staunch(adjective, clear, tough, severe, determined) |
| steadfast(adjective, clear, complete, tough, severe) |
| stimulating |
| sultry(adjective, passionate, heavy, hot, ardent) |
| sweltering(adjective, hot, heated, stifling) |
| tireless(adjective, tenacious) |
| voracious(adjective, keen, passionate, enthusiastic, excited) |
| acute(adjective, strong, intense, powerful, deep) |
| agonizing(adjective, strong, intense, powerful, penetrating) |
| all-consuming(adjective, strong, passionate, powerful, excited) |
| amorous(adjective, kind, friendly, warm, tender) |
| angry(adjective, intense, passionate, violent, enthusiastic) |
| assiduous |
| biting(adjective, strong, intense, powerful, penetrating) |
| bitter(adjective, strong, intense, powerful, animated) |
| blistering(adjective, hot, heated, sweltering, stifling) |
| boiling over(verb, phrasal verb, feeling) |
| bold(adjective, tenacious) |
| calorific |
| captivated |