Synonyms of noxious in English:

noxious


See definition of noxious

adjective

1‘the discharge of noxious effluents into streams and rivers’

SYNONYMS
poisonous, toxic, deadly, virulent
harmful, dangerous, pernicious, damaging, destructive, environmentally unfriendly
very unpleasant, nasty, disgusting, awful, dreadful, horrible, terrible, vile, revolting, foul, sickening, nauseating, nauseous, appalling, offensive, foul-smelling, evil-smelling, malodorous, fetid, putrid, rancid, unwholesome, unhealthy, insalubrious
informal ghastly, horrid
Northern Irish informal bogging
literary noisome, mephitic
archaic disgustful
rare miasmal, miasmic, nocuous, olid
ANTONYMS

innocuous, safe, pleasant