| keen(adjective, severe, sharp, unpleasant, lively) |
| mordant(adjective, attack, respect, severe, sharp) |
| stinging(adjective, attack, respect, keen, sharp) |
| grim(adjective, strong, hard, tough, severe) |
| rigorous(adjective, strong, hard, tough, severe) |
| scathing(adjective, attack, respect) |
| dour(adjective, close, hard, severe, harsh) |
| incisive(keen, sharp, lively, cutting) |
| piquant(adjective, severe, sharp, harsh, unpleasant) |
| strict(adjective, strong, hard, tough, severe) |
| stringent(adjective, severe, harsh, cruel, serious) |
| virulent |
| acidic(adjective, attack, respect, severe, sharp) |
| acidulous |
| acute(adjective, severe, keen, sharp, lively) |
| astringent drug(noun, expression, idiom) |
| authoritarian(adjective, strong, hard, tough, severe) |
| corrosive(adjective, attack, respect) |
| mordacious(adjective, attack, respect, biting) |
| rigid(adjective, strong, hard, tough, severe) |