What are the antonyms for ROUTINE?

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Synonyms for ROUTINE

Usage Examples for ROUTINE

  1. The days were pleasantly taken up with fishing, shooting, moving on, setting up and taking down camp, and all the expected routine of a mountain expedition; but, so far, there had been nothing unusual or even uncomfortable to any great degree. - "The Come Back" by Carolyn Wells
  2. Such jobs were routine for M. R. Gabriel. - "Unwise Child" by Gordon Randall Garrett