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
hard-hitting
characterized by or full of force and vigor
a hard-hitting expose
a trenchant argument
searching
having keenness and forcefulness and penetration in thought, expression, or intellect
searching insights
trenchant criticism