The Collaborative International Dictionary
Ingratefulness
Ingrateful \In"grate`ful\, a. [L. ingratus ingrateful (pref. in- not + gratus beloved, dear, grateful) + -ful: cf. F. ingrat. See Grateful.]
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Ungrateful; thankless; unappreciative.
--Milton.He proved extremely false and ingrateful to me.
--Atterbury. -
Unpleasing to the sense; distasteful; offensive.
He gives . . . no ingrateful food.
--Milton. -- In"grate`ful*ly, adv. -- In"grate`ful*ness, n.
Wiktionary
ingratefulness
n. Quality of being ingrateful.