Antonyms of noun thoughtlessness

1 of 2 senses of thoughtlessness

Sense 1
inconsideration, inconsiderateness, thoughtlessness -- (the quality of failing to be considerate of others)
       Antonym of thoughtfulness (Sense 2)
      => consideration, considerateness, thoughtfulness -- (kind and considerate regard for others; "he showed no consideration for her feelings")

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

2 senses of thoughtlessness

Sense 1
inconsideration, inconsiderateness, thoughtlessness -- (the quality of failing to be considerate of others)
       => unkindness -- (lack of sympathy)

Sense 2
unthoughtfulness, thoughtlessness -- (the trait of not thinking carefully before acting)
       => trait -- (a distinguishing feature of your personal nature)