a. [ Compressed form of out-of-sight. ] same as groovy, sense 1. [ informal, 1960's ]
Syn. -- bang-up, bully, cool, corking, cracking, dandy, far-out, great, groovy, keen, neat, nifty, not bad(predicate), out-of-sight, peachy, psychedelic, slap-up, swell, smashing. [ PJC ]