Toxic

a.

1.

Of or pertaining to poison; poisonous; as, toxic medicines.

Adj.

1.

toxic - of or relating to or caused by a toxin or poison; "suffering from exposure to toxic substances" Antonyms: atoxic, nontoxic - not producing or resulting from poison

baleful, baneful, catching, communicable, contagious, corroding, corrosive, corrupting, corruptive, counterproductive, damaging, deleterious, destructive, detrimental, disadvantageous, disserviceable, distressing, envenomed, harmful, hurtful, infectious, infective, injurious, malefic, malevolent, malign, malignant, mephitic, miasmal, miasmatic, miasmic, mischievous, noisome, noxious, ominous, pernicious, pestiferous, pestilential, poison, prejudicial, scatheful, toxicant, toxiferous, venenate, veneniferous, venenous, venomous, vicious, virulent