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 satisfaction.

Not satisfying or affording full gratification of appetite or desire; not giving content; not convincing the mind.

adj. not up to expectations

"Such series tend to end in unsatisfying ways, mostly because their authors got tired of them."

unsatisfactory   

satisfying   

unsatisfyingly    unsatisfyingness   

empty    hungry   

satisfying   

unsatisfactory    ambivalent    illusory    disappoint    unformed    akin    unconvincing    unreal    inappropriate    unprofitable