(n.) Unthankfulness; insensibility to kindness or favors received; ungratefulness\.

benefits forgot blindness deafness grudging thanks halfhearted thanks incognizance incomprehension ingratitude insensibility mindlessness nonacknowledgment nonrealization thanklessness unappreciation unappreciativeness unawareness unconsciousness ungratefulness unmindfulness unthankfulness unwittingness