trenchant

having keenness and forcefulness and penetration in thought, expression, or intellect; "searching insights"; "trenchant criticism"

characterized by or full of force and vigor; "a hard-hitting expose"; "a trenchant argument"

clearly or sharply defined to the mind; "clear-cut evidence of tampering"; "Claudius was the first to invade Britain with distinct...intentions of conquest"; "trenchant distinctions between right and wrong"