Lacking in proper gratitude or willingness to acknowledge a benefit, favour, etc.; ungrateful, unappreciative (to or †unto). Obsolete.

Showing or marked by ingratitude; thankless, ungrateful. Also with of. Obsolete.

Not rendering thanks; not feeling or exhibiting gratitude.

Const. for or †of (a thing), to (a person).

Not feeling or showing gratitude; ungrateful, unthankful. archaic.

Not moved by or expressing gratitude; unthankful, ungrateful. Also figurative of things: Making no return, unresponsive.

Ungrateful; = ingrate, adj. 3. (In later use chiefly Scottish)

Not feeling or showing gratitude.

Not feeling or displaying gratitude.

Ungrateful, thankless.

(un-, prefix1 affix 4.)

Not giving thanks (for something); ungrateful.