hard-hitting vs high-pressure

hard-hitting and high-pressure both are adjectives.

Word	Noun	Adjective	Verb	Adverb
hard-hitting	No	Yes	No	No
high-pressure	No	Yes	No	No

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

hard-hitting and high-pressure: aggressively and persistently persuasive

hard-hitting (adjective)	high-pressure (adjective)
aggressively and persistently persuasive	aggressively and persistently persuasive
characterized by or full of force and vigor