Antonyms of noun conscientiousness

2 senses of conscientiousness

Sense 1
conscientiousness -- (the quality of being in accord with the dictates of conscience)
       Antonym of unconscientiousness (Sense 1)
      => unconscientiousness -- (the quality of being willing to ignore the dictates of conscience)

Sense 2
conscientiousness, painstakingness -- (the trait of being painstaking and careful)
       Antonym of unconscientiousness (Sense 2)
      => unconscientiousness -- (the trait of not being painstaking or careful)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun conscientiousness

2 senses of conscientiousness

Sense 1
conscientiousness -- (the quality of being in accord with the dictates of conscience)
       => conscience -- (conformity to one's own sense of right conduct; "a person of unflagging conscience")

Sense 2
conscientiousness, painstakingness -- (the trait of being painstaking and careful)
       => carefulness -- (the quality of being careful and painstaking; "I admired the carefulness of his work")