1.  unconscientiousness(n = noun.attribute) - the quality of being willing to ignore the dictates of conscience;
is a kind of conscience
Antonym: conscientiousness
Derived form adjective unconscientious₁

2.  unconscientiousness(n = noun.attribute) - the trait of not being painstaking or careful;
is a kind of carelessness, sloppiness
Antonym: conscientiousness