| heavy(adjective, strong, hard, tough, severe) |
| implacable(adjective, strong, hard, tough, harsh) |
| inelastic |
| intricate(adjective, tough, rough, difficult, heavy) |
| mean(adjective, tough, severe, rough, difficult) |
| murderous(adjective, hard, tough, harsh, cruel) |
| on target(noun, exact, precise, accurate) |
| painful(adjective, hard, tough, severe, difficult) |
| peremptory(adjective, severity, authoritative, overbearing) |
| perfect(noun, exact, precise, accurate) |
| pitiless(adjective, hard, tough, severe, harsh) |
| prim(adjective, thoughtful, sober, cautious, prudent) |
| right on(noun, exact, precise, accurate) |
| ruthless(adjective, hard, tough, harsh, unpleasant) |
| scientific(adjective, close, correct, solid, exact) |
| specific(noun, correct, solid, perfect, exact) |
| steep(adjective, severe, stringent, drastic) |
| tart(adjective, severe) |
| taut(adjective, rigid) |
| taxing(adjective, heavy) |