'nifty' definitions:

Definition of 'nifty'

From: WordNet
adjective
Very good; "he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing" [syn: bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad(p), peachy, slap-up, swell, smashing]

Definition of 'nifty'

From: GCIDE
  • nifty \nifty\ adj.
  • 1. Very good; excellent; -- an informal term meaning about the same as groovy, sense 1. [informal, 1960's]
  • Syn: bang-up, bully, cool, corking, cracking, dandy, great, groovy, keen, neat, not bad(predicate), peachy, slap-up, swell, smashing. [WordNet 1.5]
  • 2. Stylish; attractive; -- of clothing; as, a nifty outfit. [PJC]