i Register
In some senses, grossly is marked as informal, archaic. Watch for register when choosing this word.
adv
Greatly; to a large degree, especially one large enough to be frankly appreciable.
grossly inflated expectations
grossly enlarged hepatic lobes, evident on palpation
To a serious, severe, or offensive degree.
grossly misjudged
grossly inflamed
In a gross (disgusting) manner; without delicacy.
The men were talking grossly about their sexual conquests.
Roughly; approximately; inexactly; sketchily.