You can use trenchant to describe something such as a criticism or comment that is very clear, effective, and forceful. He was shattered and bewildered by this trenchant criticism His comment was trenchant and perceptive. expressed very strongly, effectively, and directly without worrying about offending people (present participle of trenchier; TRENCH)
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"