inconsiderateness

/ˌɪnkənˈsɪdərətnəs/
noun
  1. The quality or state of being thoughtless and not caring about the feelings or needs of others.
    • Living with someone who shows constant inconsiderateness can be very frustrating.
    • The teacher talked to the student about the inconsiderateness of talking during class.
    • His inconsiderateness was evident when he kept interrupting the speaker.