Ingrateful

[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.

2. Unpleasing to the sense; distasteful; offensive.

He gives . . . no ingrateful food.

-- In·grate·ful·ly, adv. -- In·grate·ful·ness, n.