- poisonous, toxicant - having the qualities or effects of a poison
Antonyms: nontoxic, atoxic (indirect, via toxic)
- poisonous - not safe to eat
Antonyms: edible, comestible, eatable (indirect, via inedible)
- poisonous, venomous, vicious - marked by deep ill will; deliberately harmful; "a malevolent lie"; "poisonous hate...in his eyes"- Ernest Hemingway; "venomous criticism"; "vicious gossip"
Antonyms: benevolent, good (indirect, via malevolent)