Another word for trenchant
Having a cutting edge
unsparing, critical, emphatic, vigorous, impressive, strong, dynamic, pointed, intense, positive, weighty, salient, significant, pithy, sententious, crushing, forcible, crisp, caustic, concise, succinct, razor-sharp, comprehensive, pregnant, neat, to the point, graphic, explicit, ponderous; see also intelligent 1, profound 2.
Another word for trenchantadjective
Possessing or displaying perceptions of great accuracy and sensitivity:acute, incisive, keen1, penetrating, perceptive, probing, sensitive, sharp. See careful, sharp
So sharp as to cause mental pain:acerbic, acid, acidic, acrid, astringent, biting, caustic, corrosive, cutting, mordacious, mordant, pungent, scathing, sharp, slashing, stinging, truculent, vitriolic. See attack, respect