Antonyms of adj poisonous

3 senses of poisonous

Sense 1
poisonous, toxicant -- (having the qualities or effects of a poison)

INDIRECT (VIA toxic) -> nontoxic, atoxic -- (not producing or resulting from poison)

Sense 2
poisonous -- (not safe to eat)

INDIRECT (VIA inedible) -> edible, comestible, eatable -- (suitable for use as food)

Sense 3
poisonous, venomous, vicious -- (marked by deep ill will; deliberately harmful; "poisonous hate"; "venomous criticism"; "vicious gossip")

INDIRECT (VIA malicious) -> unmalicious -- (not malicious or spiteful)

Similarity of adj poisonous

3 senses of poisonous

Sense 1
poisonous, toxicant -- (having the qualities or effects of a poison)
       => toxic (vs. nontoxic) -- (of or relating to or caused by a toxin or poison; "suffering from exposure to toxic substances")

Sense 2
poisonous -- (not safe to eat)
       => inedible (vs. edible), uneatable -- (not suitable for food)

Sense 3
poisonous, venomous, vicious -- (marked by deep ill will; deliberately harmful; "poisonous hate"; "venomous criticism"; "vicious gossip")
       => malicious (vs. unmalicious) -- (having the nature of or resulting from malice; "malicious gossip"; "took malicious pleasure in...watching me wince"- Rudyard Kipling)