trenchant / tren-chuhnt
1. incisive or keen, as language or a person; caustic; cutting: trenchant wit.
2. vigorous; effective; energetic: a trenchant policy of political reform.
3. clearly or sharply defined; clear-cut; distinct.
Example: The teacher's trenchant criticism discouraged all but the most thick-skinned of his students.
Origin: 1275–1325; ME tranchaunt < AF; OF trenchant, prp. of trenchier to cut.