groovy

Etymology 1

groove + -y

adj

1. Of, pertaining to, or having grooves.
   The back of the tile was groovy so that it could hold the adhesive compound.
2. (dated) Set in one's ways.
   She'd give anything to be able to believe it, but she's a hard woman, and brooding along certain lines makes one groovy. 1909, Rudyard Kipling, The House Surgeon

Etymology 2

From the phrase in the groove, originally in reference to the grooves of an early phonograph record.

adj

1. (dated, slang) Cool, neat, interesting, fashionable.
   When you move me, everything is groovy. 2012, Pat Monahan (Train), Drive By (song lyrics)
   Men In Black 3 lacks the novelty of the first film, and its take on the late ’60s feels an awful lot like a psychedelic dress-up party, all broad caricatures and groovy vibes. May 24, 2012, Nathan Rabin, “Film: Reviews: Men In Black 3”, in The Onion AV Club
   Well, I love it! Move really fast, reverse time, save everyone? That sounds groovy! I’m gonna have to try that some day! Feb 12 2015, Tina Alexander, Daniel Baxter, “How X-Men: Days of Future Past Should Have Ended”, in How It Should Have Ended, season 7, episode 3, spoken by Superman (Daniel Baxter), How It Should Have Ended, via YouTube

noun

1. (dated, slang) A trendy and fashionable person.