The best replacement for toxic is poisonous.

The best alternatives to toxic are rated as following:
★★★★★  poisonous
★★★★  hazardous
★★★  toxin
★★★  toxic spikes
★★★  sludge bomb
★★  poison powder
★★  thunder wave
★★  faint
★★  will o wisp
★  poison dark souls
★  sleep powder
★  vapor x
★  poison
★  yeah
★  burn
★  cutback
★  leech seed
★  chronic toxic
  fatal1ty
  vapor-x
  will-o-wisp
  tired
  rage broadheads
  confuse ray
  rolling in the deep
  rock to the rhythm
  nontoxic

Your alternative for toxic is not listed? Suggest!
Speaking about toxic, one probably shouldn't forget about taste of your lips.

Other search terms related to toxic and their ratings are:
★★★★★ taste of your lips
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Google Trends

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