| severe(adjective, characteristic, strong, hard, tough) |
| rigorous(adjective, feature, strong, hard, tough) |
| exact(adjective, feature, close, quality, strong) |
| rigid(adjective, characteristic, good, strong, hard) |
| precise(adjective, feature, close, quality, hard) |
| harsh(adjective, characteristic, strong, hard, tough) |
| stern(adjective, characteristic, hard, tough, easy) |
| scrupulous(adjective, feature, good, close, quality) |
| accurate(adjective, feature, close, quality, hard) |
| careful(adjective, feature, correct, slight, fine) |
| exacting(adjective, characteristic, hard, tough, easy) |
| meticulous(adjective, feature, hard, correct, slight) |
| stringent(adjective, hard, tough, severe, rough) |
| austere(adjective, characteristic, strong, hard, tough) |
| demanding(adjective, characteristic, hard, tough, easy) |
| hard(adjective, strong, tough, easy, severe) |
| inflexible(adjective, characteristic, strong, hard, tough) |
| close(adjective, feature, correct, slight, severe) |
| uncompromising(adjective, hard, tough, severe, rough) |
| punctual(adjective, characteristic, time, quality, timing) |