This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Not providing reward or satisfaction

Not rewarding; not affording a reward; uncompensating.

adj. not rewarding; not providing personal satisfaction

"MylesL the movie is beautifully crafted, but very slow and "unrewarding" in plot."

thankless    profitless    ungratifying    unappreciated   

six-party    upward-pointing    unlifelike    unintermitted    unrefreshing