toxic Get Printable Handwriting (tox-ic) 2 syllables Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. poisonous or deadly Example Sentence Some berries are toxic to humans. Synonyms poisonous; dangerous; harmful; venomous; lethal Antonyms harmless; nontoxic; safe Hear It! Say It! Write It! toxic Switch to cursive Start Share with your friends: