When something affects you adversely, it's harmful or negative. Holding a cinder block will adversely affect your running speed. When you talk about things that are acting adversely, they are harming something or holding it back in some way. Not getting enough sleep will adversely affect your performance in school.

What's another word for adversely?

In this page you can discover 16 synonyms, antonyms, idiomatic expressions, and related words for adversely, like: negatively, unfavorably, unsympathetically, unduly, with scarce sympathy, with prejudice, resentfully, detrimentally, with a cold eye, detrimental and without sympathy.

Is it adversely affect or adversely affect?

"Adverse effect"is right. It means unfavorable impact. "Affect" is a verb. To describe it, the correct word (ie the adverb) should have been "adversely".