The best replacement for trans is cis.

The best alternatives to trans are rated as following:
★★★★★  cis
★★★★  saturated fat
★★  trans*
★  cis fat
★  transgender
★  cis genetics
★  cis isomers
★  saturated fat which is worse
★  inter
★  cis nmr
★  cis golgi
  cis fats
  cis fatty acids
  cis cyclohexane
  goped
  trans
  cis fatty acid
  e z
  cis melting point
  saturated fats
  sis
  cis boiling point
  c4 trans
  drag
  gauche
  cis more stable
  in cis

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Speaking about trans, one probably shouldn't forget about asterisk.

Other search terms related to trans and their ratings are:
★★★★★ asterisk
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Google Trends

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trans
cis
saturated fat