IPA: /ˈɡroʊsli/
KK: /ˈgroʊsli/
In a way that is very obvious or extreme; often used to describe something that is wrong or unacceptable.
The report grossly exaggerated the impact of the new policy.
Grossly → It is formed from "gross" (from Old French *gros*, meaning large or thick) and "-ly" (meaning in a manner of). The word "grossly" means in a manner that is large or extreme, often used to describe something that is excessive or blatant.
Think of something being done in a 'large' or 'extreme' way — 'gross' means large, and '-ly' indicates the manner of doing it.