GROOVIEST

GROOVY

groovy, swagger

(adjective) (British informal) very chic; “groovy clothes”

bully, bang-up, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, peachy, slap-up, swell, smashing, old

(adjective) very good; “he did a bully job”; “a neat sports car”; “had a great time at the party”; “you look simply smashing”; “we had a grand old time”

Source: WordNet® 3.1

Adjective

grooviest

superlative form of groovy: most groovy

Source: Wiktionary