thankless

Not feeling or showing gratitude; ungrateful.

Not likely to be appreciated.

Unthankful; ungrateful; not acknowledging kindness or benefits.

Not deserving thanks, or not likely to be rewarded with thanks: as, a thankless task.

Synonyms See grateful.

Not acknowledging favors; not expressing thankfulness; unthankful; ungrateful.

Not obtaining or deserving thanks; unacceptable.

not appreciated or rewarded

ungrateful or unappreciative

not feeling or showing gratitude