POISONOUS /ˈpɔɪznəs/ ► audio Scrabble 11 Words With Friends 14 Definition adjective having the qualities or effects of a poison. — synonyms: toxicant adjective not safe to eat. adjective marked by deep ill will. — synonyms: venomous, vicious See all 88 words you can make from POISONOUS → 9-letter words Words starting with P Words ending with S ← Unscramble different letters