adverb
grossly
GROHS-lee
adverb
1
To a very large or serious degree, often in a negative way.
"The report was grossly inaccurate."
"He grossly underestimated how long the project would take."
How to Use Grossly
Learner’s notesIn plain EnglishUsed before an adjective to intensify it, usually about something being seriously wrong or exaggerated.
Common pairings
grossly unfair
grossly exaggerated
grossly underpaid
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The report was _____ inaccurate.
Etymology
From gross plus the "-ly" adverb ending.