1) Feeling 2) French word used in English 3) Lack of appreciation 4) Not giving thanks 5) Oblivion of benefits 6) Thanklessness 7) The state of being ungrateful 8) Unappreciativeness 9) Ungratefulness 10) Unthankfulness 1) Ungratefulness 
• (n.) Want of gratitude; insensibility to, forgetfulness of, or ill return for, kindness or favors received; unthankfulness; ungratefulness.
In·grat'i·tude noun [ French ingratitude , Latin ingratitudo . See Ingrate .] Want of gratitude; insensibility to, forgetfulness of, or ill return for, kindness or favors received; unthankfulness; ungratefulness. « Ingratitude , thou marble-hearted fiend.» ...
[n] - a lack of gratitude
ungratefulness noun a lack of gratitude
the state of being ungrateful; unthankfulness.