| vehement(adjective, clear, strong, tough, severe) |
| effectual(adjective, strong, power, valid, legal) |
| intense(adjective, clear, strong, great, tough) |
| assertive(adjective, strong, tough, smart, firm) |
| sturdy(adjective, strong, great, sound, tough) |
| aggressive(adjective, clear, tough, severe, keen) |
| authoritative(adjective, strong, energetic, important, powerful) |
| efficacious(adjective, strong, power, valid, legal) |
| robust(adjective, strong, great, sound, tough) |
| virile(adjective, strong, powerful, effective, dynamic) |
| insistent(adjective, strong, firm, energetic, powerful) |
| stalwart(adjective, strong, great, sound, tough) |
| drastic(adjective, severe, extreme) |
| firm(noun, adjective, clear, strong, sound) |
| pithy(adjective, strong, sharp, powerful, effective) |
| severe(adjective, strong, sharp, harsh, intense) |
| significant(adjective, sharp, energetic, important, powerful) |
| spirited(adjective, strong, tough, keen, bright) |
| strenuous(adjective, action, strong, tough, smart) |
| valid(adjective, clear, strong, power, direct) |