uncertainty vs incertitude

uncertainty and incertitude both are nouns.

Word	Noun	Adjective	Verb	Adverb
uncertainty	Yes	No	No	No
incertitude	Yes	No	No	No

As nouns, uncertainty and incertitude are synonyms defined as:

Other synonyms of uncertainty include doubt, doubtfulness, dubiety, dubiousness.

uncertainty (noun)	incertitude (noun)
being unsettled or in doubt or dependent on chance	the state of being unsure of something
the state of being unsure of something