indecisiveness vs dubiousness

indecisiveness and dubiousness both are nouns.

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

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

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

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

indecisiveness (noun)	dubiousness (noun)
the trait of irresolution; a lack of firmness of character or purpose	uncertainty about the truth or factuality or existence of something
doubt concerning two or more possible alternatives or courses of action	the state of being unsure of something