irresolution vs irresoluteness

irresolution and irresoluteness both are nouns.

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

As nouns, irresolution and irresoluteness are synonyms defined as:

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

irresolution (noun)	irresoluteness (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