Deleterious often refers to gradually harmful effects, not always immediate. Excessive screen time has a deleterious influence on children's eyesight.
Pro Tip 2/3
Negative Connotation
'Deleterious' carries a negative tone, expressing disapproval of the harmful outcomes. Polluting factories have deleterious effects on the environment.
Pro Tip 3/3
Academic Nuance
'Deleterious' is common in scholarly texts; it could sound out of place in casual conversation. The study shows a deleterious impact of sedentary lifestyle.