1. （批评、评论等）鲜明的，犀利的，尖锐的，中肯的
You can use trenchant to describe something such as a criticism or comment that is very clear, effective, and forceful.
1. clearly or sharply defined to the mind
e.g. clear-cut evidence of tampering
Claudius was the first to invade Britain with distinct...intentions of conquest
trenchant distinctions between right and wrong
2. characterized by or full of force and vigor
e.g. a hard-hitting expose
a trenchant argument
Synonym: hard-hitting
3. having keenness and forcefulness and penetration in thought, expression, or intellect
e.g. searching insights
trenchant criticism
Synonym: searching