irresoluteness vs irresolution

irresoluteness and irresolution both are nouns.

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

As nouns, irresoluteness and irresolution are synonyms defined as:

irresoluteness and irresolution: the trait of being irresolute; lacking firmness of purpose

irresoluteness (noun)	irresolution (noun)
the trait of being irresolute; lacking firmness of purpose	the trait of being irresolute; lacking firmness of purpose
	doubt concerning two or more possible alternatives or courses of action