exciting, fashionable, interesting
✳️Did you see Jimmy's groovy new necklace? It looks so cool.
✳️The DJ at the club we went to last night played some really groovy tracks.
This word first appeared in the sixties and it was widely-used by young people who were involved in the hippy movement. It went out of fashion in the early seventies, but became popular again early in the twenty-first century.