cozy KK:[kozi] adj. (-zi·er, -zi·est) giving a feeling of comfort, warmth, and relaxation. (a) (of a relationship or conversation) intimate and relaxed. (b) avoiding or not offering challenge or difficulty; complacent: Ex: a rather cozy assumption among lenders that they would never go bust. (c) (of a transaction or arrangement) working to the mutual advantage of those involved (used to convey a suspicion of corruption).