The best replacement for fertile is infertile.

The best alternatives to fertile are rated as following:
★★★★★  infertile
★★★★  non fertile eggs
★★★  ovulation
★★  sterile
★★  fissile
★  infertile chicken eggs
★  ovulating
★  futile
★  fecund
  non fertile chicken eggs
  non fertile
  ovulate

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Speaking about fertile, one probably shouldn't forget about irregular periods.

Other search terms related to fertile and their ratings are:
★★★★★ irregular periods
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