adverse

/ædˈvərs/
/ˈædˌvərs/

adjective

Preventing success or development; harmful; unfavorable.

taxes are having an adverse effect on production

unfavourable,disadvantageous,inauspicious,unpropitious,unfortunate,unlucky,untimely,untoward

SYNONYMS

disadvantageousinauspiciousunfavourableunfortunateunluckyunpropitiousuntimelyuntoward