a. harmful to living things; injurious to health
We must trace the source of these noxious gases before they asphyxiate us.
Sentence in Classic:
Evil company on earth is so noxious that the plants, as if by instinct, withdraw from the company of whatsoever is deadly or hurtful to them.
A Portrait of the Artist as a Young Man By James Joyce Context
Moreover, it cannot be denied that the influence of the classical authors is in the highest degree moral, while, unfortunately, with the study of the natural sciences are associated the false and noxious doctrines which are the curse of our day.
Anna Karenina(V2) By Leo Tolstoy Context