| tense(verb, adjective, hard, strengthen, stiff) |
| thick(adjective, close, strong, hard, tough) |
| abiding(adjective, calm, strong, complete, secure) |
| confirmed(adjective, characteristic, hard, rough, harsh) |
| decisive(adjective, good, set, clear, strong) |
| changeless(adjective, solid, certain, stable, limited) |
| close(adjective, set, fix, hard, settle) |
| exact(adjective, close, correct, severe, plain) |
| immobile(adjective, calm, quiet, strong, secure) |
| immutable(adjective, calm, strong, hard, secure) |
| pertinacious(adjective, strong, tough, determined, steady) |
| set in stone(expression, adjective, idiom, calm, set) |
| single-minded(adjective, tough, solid, intense, deliberate) |
| strong-willed(adjective, strong, tough, intense, deliberate) |
| tireless(adjective, strong, determined, steady, resolute) |
| undeviating(adjective, solid, intense, certain, deliberate) |
| unvarying(adjective, calm, strong, secure, solid) |
| dedicated(adjective, set, clear, strong, tough) |
| earnest(adjective, strong, severe, harsh, important) |
| emphatic(adjective, definite, persistent, unqualified, uncompromising) |