noxious
/ˈnäk-shəs/
adjective
physically harmful or destructive to living beings
constituting a harmful influence on mind or behavior; especially : morally, corrupting
disagreeable, obnoxious
noxious waste
pernicious baneful noxious deleterious detrimental mean exceedingly harmful. pernicious implies irreparable harm done through evil or insidious corrupting or undermining. baneful implies injury through poisoning or destroying.