Deleterious

a.

1.

Hurtful; noxious; destructive; pernicious; as, a deleterious plant or quality; a deleterious example.

Adj.

1.

deleterious - harmful to living things; "deleterious chemical additives" Synonyms: injurious, hurtful

baleful, baneful, corroding, corrosive, corrupting, corruptive, counterproductive, deadly, destroying, disadvantageous, disserviceable, distressing, harmful, injurious, lethal, malefic, malevolent, malign, malignant, mischievous, noisome, noxious, ominous, pernicious, poisonous, prejudicial, ruining, ruinous, scatheful, toxic, unadvantageous, unfavorable, unprofitable, unrewarding, useless, venenate, veneniferous, venenous, venomous, vicious, virulent, worthless