GNU Collaborative International Dictionary of English

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Found one definition

1.       
   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]