| climacteric(adjective, important, safety) |
| fault-finding(adjective, opinion, description, characterization, judgement) |
| fundamental(adjective, severe, important, significant, original) |
| imperative(adjective, big, important, determined, significant) |
| key(adjective, important, significant, essential, basic) |
| main(adjective, significant, original, essential, vital) |
| minute(adjective, close, exact, precise, honorable) |
| punctilious(adjective, close, honorable, demanding, meticulous) |
| touchy(adjective, mean, bad, difficult, delicate) |
| trenchant(adjective, severe, keen, sharp, unpleasant) |
| caustic(adjective, severe, keen, sharp, harsh) |
| cutting(adjective, mean, severe, keen, sharp) |
| fine(adjective, exact, discriminating) |
| hairy(adjective, informal, important) |
| hard(adjective, tough, difficult, harsh, delicate) |
| necessary(adjective, big, important, significant, substantial) |
| rigid(adjective, severe) |
| caviling(adjective, mean, severe, harsh, nervous) |
| central(adjective, important, significant, essential, vital) |
| critic(adjective, severe, harsh, unsympathetic, unfavorable) |