dubiousness vs doubtfulness

dubiousness and doubtfulness both are nouns.

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

As nouns, dubiousness and doubtfulness are synonyms defined as:

dubiousness and doubtfulness: uncertainty about the truth or factuality or existence of something

Other synonyms of dubiousness include doubt, question.

As nouns, dubiousness and doubtfulness are synonyms defined as:

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

dubiousness (noun)	doubtfulness (noun)
uncertainty about the truth or factuality or existence of something	uncertainty about the truth or factuality or existence of something
the state of being unsure of something	the state of being unsure of something