noxious

adjective

1. harmful or injurious to health or physical well-being: noxious fumes.
2. morally harmful; corrupting; pernicious: a noxious plan to spread dissension.

adjective

1. poisonous or harmful
2. harmful to the mind or morals; corrupting

adj.c.1500, from Latin noxius “hurtful, injurious,” from noxa “injury, hurt, damage entailing liability” (related to nocere “to hurt,” and to nex “slaughter”), from PIE *nek-ro-, causative form of root *nek- “death” (see necro-). adj.

1. Harmful to living things; injurious to health.