detrimental
/ˌdɛtɹɪˈmɛntəl/adjective
Having a harmful or damaging effect.
Example sentences
- “Skipping breakfast every day can be detrimental to your concentration.”
- “Too much screen time may be detrimental to young children's sleep.”
Formal; 'detrimental to' is the standard pattern, as in 'detrimental to health'. In everyday speech people just say 'bad for'.