The best replacement for good luck is bad luck.

The best alternatives to good luck are rated as following:
★★★★★  bad luck
★★★  break a leg
★★★  goodluck
★★  good luck
★★  hard work
★★  good lucky
★  best of luck
★  best wishes
★  all the best
  crucible
  good policy

Your alternative for good luck is not listed? Suggest!
Speaking about good luck, one probably shouldn't forget about hesitation.

Other search terms related to good luck and their ratings are:
★★★★★ hesitation
★ saying good luck
You have in mind a companion for good luck and it is not yet here? Propose!



Google Trends

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good luck
bad luck
break a leg