searching, trenchant -- (having keenness and forcefulness and penetration in thought, expression, or intellect; "searching insights"; "trenchant criticism")
hard-hitting, trenchant -- (characterized by or full of force and vigor; "a hard-hitting expose"; "a trenchant argument")
clear-cut, distinct, trenchant -- (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")
(Sound)
