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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.]

  1. Ungrateful; thankless; unappreciative.
    --Milton.

    He proved extremely false and ingrateful to me.
    --Atterbury.

  2. 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.