| impassioned(adjective, bright, intense, passionate, violent) |
| indefatigable(adjective, strong, sound, tough, fit) |
| industrious(adjective, strong, moving, keen, energetic) |
| resolute(adjective, strong, keen, solid, energetic) |
| snappy(adjective, action, strong, moving, tough) |
| solid(adjective, strong, sound, complete, tough) |
| tireless(adjective, strong, energetic, lively, determined) |
| flourishing(adjective, strong, great, sound, tough) |
| staunch(noun, adjective, health, strong, sound) |
| stiff(adjective, strong, pleasant, severe, solid) |
| tenacious(adjective, strong, sound, tough, fit) |
| virile(adjective, strong, sound, tough, fit) |
| aggressive(adjective, strong, keen, energetic, violent) |
| bold(adjective, tough, keen, smart, energetic) |
| determined(adjective, strong, keen, solid, energetic) |
| durable(adjective, strong, sound, tough, solid) |
| emphatic(adjective, strong, severe, sharp, intense) |
| ever-changing |
| excited(adjective, keen, warm, energetic, passionate) |
| firm(noun, adjective, strong, tough, fit) |