groovy vs not bad

groovy and not bad both are adjectives.

Word	Noun	Adjective	Verb	Adverb
groovy	No	Yes	No	No
not bad	No	Yes	No	No

As adjectives, groovy and not bad are synonyms defined as:

Other synonyms of groovy include bang-up, bully, corking, cracking, dandy, great, keen, neat, nifty, old, peachy, slap-up, smashing, swell.

groovy (adjective)	not bad (adjective)
(British informal) very chic	excellent
excellent