Where does “unsolemnize” come from?

unsolemnize (English) comes from English solemnize, from Old French solemnisier, from Latin solemnizare, from Latin sōlemnis.

unsolemnize (English): To divest of solemnity

Definitions

Step	Language	Word	Meaning
1	English	solemnize	To make solemn, or official, through ceremony or...
2	Old French	solemnisier	—
3	Latin	solemnizare	—
4	Latin	sōlemnis	—

unsolemnize — Etymology, Origin & Word History | Etymology Explorer