The best replacement for relevant is irrelevant.

The best alternatives to relevant are rated as following:
★★★★★  irrelevant
★★★  related
★★★  relative
★★  reliable
★★  relevant
★  relevent
★  pertinent
★  not relevant
★  respective
★  appropriate
  important
  revelant
  relevance
  material
  suitable

Your alternative for relevant is not listed? Suggest!
Speaking about relevant, one probably shouldn't forget about scarcity.

Other search terms related to relevant and their ratings are:
★★★★★ scarcity
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Google Trends

Scale is based on the average worldwide traffic of relevant in all years. Click on graph for more.
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