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deleterious (adj) harmful.
The deleterious effect of stress on health is its harmful effect on health. Pollution has a deleterious effect on environment, that is, environment is endangered because of pollution. Eating fatty foods can harm us, so fatty foods are deleterious to our health.
- Most of the birth control pills are deleterious to health as they have been found to cause hypertension in the users.
- History has proved many times that the spread of religious fanaticism is deleterious to the society as it results in large-scale violence and bloodshed which, ironically, every religion is against.