| passion(noun, feeling, enthusiasm, zeal, ardor) |
| agonizing(adjective, difficulty, pain, misery, suffering) |
| ardor(noun, feeling, enthusiasm, zeal) |
| avidity(noun, feeling, enthusiasm, zeal, ardor) |
| difficult(adjective, difficulty, pain, misery, suffering) |
| disturbing(adjective, difficulty, pain, misery, suffering) |
| eagerness(noun, feeling, enthusiasm, zeal, ardor) |
| earnestness(noun, feeling, enthusiasm, zeal, ardor) |
| excruciating(adjective, difficulty, pain, misery, suffering) |
| fervor(noun, feeling, enthusiasm, zeal, ardor) |
| fierce(adjective, difficulty, pain, misery, suffering) |
| fierceness(noun, feeling, enthusiasm, zeal, ardor) |
| fire(noun, feeling, enthusiasm, zeal, ardor) |
| gusto(noun, feeling, enthusiasm, zeal, ardor) |
| harrowing(adjective, difficulty, pain, misery, suffering) |
| heat(noun, feeling, enthusiasm, zeal, ardor) |
| intensity(noun, feeling, enthusiasm, zeal, ardor) |
| jazz(noun, feeling, enthusiasm, zeal, ardor) |
| keenness(noun, feeling, enthusiasm, zeal, ardor) |
| oomph(noun, feeling, enthusiasm, zeal, ardor) |