toxic
tox-ic
adjective
Containing poison or caused by poison; harmful to living organisms.
"The chemical waste was highly toxic."
adjective
Extremely unpleasant or harmful, especially to relationships or mental well-being.
"She left the toxic work environment."
Thesaurus
Synonyms: cyanogenetic, ototoxic, cyanogenic, toxicant, nephrotoxic, hepatotoxic, virulent, deadly, venomous, poisonous