irresolution vs doubtfulness

irresolution and doubtfulness both are nouns.

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

As nouns, doubtfulness is a hypernym of irresolution; that is, doubtfulness is a word with a broader meaning than irresolution:

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

Other hypernyms of irresolution include doubt, dubiety, dubiousness, incertitude, uncertainty.

irresolution (noun)	doubtfulness (noun)
the trait of being irresolute; lacking firmness of 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