ad·verse 
/ædˈvɚs, ˈædˌvɚs/ adjective
/ædˈvɚs, ˈædˌvɚs/ adjective [more adverse; most adverse] : bad or unfavorable : not good
▪ adverse criticism/remarks ▪ He had an adverse reaction to the medicine. [=he reacted badly to the medicine; the medicine had a bad effect on him] ▪ Many fear that budget cuts will have an adverse [=damaging] effect on education. ▪ adverse circumstances/conditions/weather ▪ The drug has no adverse [=harmful] side effects.
▪ adverse criticism/remarks ▪ He had an adverse reaction to the medicine. [=he reacted badly to the medicine; the medicine had a bad effect on him] ▪ Many fear that budget cuts will have an adverse [=damaging] effect on education. ▪ adverse circumstances/conditions/weather ▪ The drug has no adverse [=harmful] side effects.
— ad·verse·ly adverb
▪ Sales were adversely affected by the bad weather. ▪ Staff changes could affect the project adversely.
▪ Sales were adversely affected by the bad weather. ▪ Staff changes could affect the project adversely.
