Antonyms of adj nontoxic

2 senses of nontoxic

Sense 1
nontoxic (vs. toxic), atoxic -- (not producing or resulting from poison)

toxic (vs. nontoxic) -- (of or relating to or caused by a toxin or poison; "suffering from exposure to toxic substances")
        => cyanogenetic, cyanogenic -- (capable of producing cyanide; "amygdalin is a cyanogenetic glucoside")
        => deadly, venomous, virulent -- (extremely poisonous or injurious; producing venom; "venomous snakes"; "a virulent insect bite")
        => hepatotoxic -- (toxic to the liver)
        => nephrotoxic -- (toxic to the kidney)
        => ototoxic -- (toxic to the organs of hearing or balance or to the auditory nerve; "some drugs are ototoxic")
        => poisonous, toxicant -- (having the qualities or effects of a poison)

Sense 2
nonpoisonous, non-poisonous, nontoxic -- (safe to eat)

INDIRECT (VIA edible) -> inedible, uneatable -- (not suitable for food)

Similarity of adj nontoxic

2 senses of nontoxic

Sense 1
nontoxic (vs. toxic), atoxic -- (not producing or resulting from poison)
       => antitoxic -- (counteracting a toxin or poison)
       => nonpoisonous, non-poisonous -- (not producing poison)
       => nonvenomous -- (not producing venom; "nonvenomous snakes")
          Also See-> harmless#1

Sense 2
nonpoisonous, non-poisonous, nontoxic -- (safe to eat)
       => edible (vs. inedible), comestible, eatable -- (suitable for use as food)