grossly
adv.to a very high and unacceptable degree. You use it to emphasize how bad, unfair, or wrong something is.
adv.to an extreme or excessive degree, typically in a way that is offensive, reprehensible, or clearly inaccurate.
“The cost of the repairs was grossly overpriced.”
“The company was found guilty of grossly underestimating the environmental impact of its new factory.”
“Legal experts argued that the defendant's rights had been grossly violated during the initial investigation, rendering the subsequent evidence inadmissible in court.”
Typically used to modify adjectives with negative connotations, such as 'unfair', 'inaccurate', or 'negligent'.
Grossly is almost exclusively used to intensify negative qualities or errors; it is not a neutral synonym for 'very'.
From gross + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.