Detrimental
Detrimental is an English adjective describing something that causes harm, damage, or disadvantage. The term conveys that the effect is negative or undesirable. It derives from the noun detriment, which itself comes from Latin detrimentum meaning loss or damage; the adjective form is attested in English from the 17th century.
In usage, detrimental is commonly paired with nouns to indicate negative impact. For example, smoking is detrimental
The word is relative and context-dependent: something considered detrimental in one setting may be less so
Related terms include synonyms such as harmful, deleterious, injurious, and damaging; antonyms include beneficial, advantageous, helpful,
Word choice note: detrimentality is a related noun in some technical usages, but detriment remains the standard