detrimental
Definitions
Tending to cause harm or damage.
Injurious or disadvantageous to a person or thing.
Examples
Smoking has a detrimental effect on your overall health.
The lack of sleep proved detrimental to his performance during the exam.
Excessive exposure to the sun can be detrimental to your skin.
Synonyms
harmful damaging injurious deleterious pernicious hurtful destructive
Antonyms
beneficial advantageous helpful favorable salutary constructive wholesome