hard-hitting vs trenchant

hard-hitting and trenchant both are adjectives.

Word	Noun	Adjective	Verb	Adverb
hard-hitting	No	Yes	No	No
trenchant	No	Yes	No	No

As adjectives, hard-hitting and trenchant are synonyms defined as:

hard-hitting (adjective)	trenchant (adjective)
aggressively and persistently persuasive	clearly or sharply defined to the mind
characterized by or full of force and vigor	characterized by or full of force and vigor
	having keenness and forcefulness and penetration in thought, expression, or intellect