Crossword Genius

Unsolemnly swear (4)

Ross

I believe the answer is:

cuss

(Other definitions for cuss that I've seen before include "Stubborn person" , "Use bad language (informal)" , "Blaspheme" , "Oath; (annoying sort of) person" , "Swear (slang)" .)

I've seen this clue in The New York Times.
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