indecisiveness vs incertitude

indecisiveness and incertitude both are nouns.

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

As nouns, incertitude is a hypernym of indecisiveness; that is, incertitude is a word with a broader meaning than indecisiveness:

indecisiveness: doubt concerning two or more possible alternatives or courses of action
incertitude: the state of being unsure of something

Other hypernyms of indecisiveness include doubt, doubtfulness, dubiety, dubiousness, uncertainty.

indecisiveness (noun)	incertitude (noun)
the trait of irresolution; a lack of firmness of character or purpose	the state of being unsure of something
doubt concerning two or more possible alternatives or courses of action