Meaning of the word deleterious in English

What does deleterious mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

deleterious

US /ˌdel.ɪˈtɪr.i.əs/
UK /ˌdel.ɪˈtɪə.ri.əs/

Adjective

harmful:

Example:
These drugs have a proven deleterious effect on the nervous system.