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

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adj. Having no boundaries or limits: unbounded space.

adj. Not kept within bounds; unrestrained: unbounded enthusiasm.

adj. having no boundaries or limits

adj. Having no bound or limit.

Having no bound or limit; unlimited in extent; hence, immeasurably great: as, unbounded space; unbounded power.

Having no check or control; unrestrained.

Synonyms Boundless, illimitable.

Uncontrolled.

adj. seemingly boundless in amount, number, degree, or especially extent

infinite   

unbounded nondeterminism    unbounded manifold   

unlimited    absolute   

abounded    astounded    bounded    compounded    confounded    founded    grounded    hounded    impounded    pounded   

boundless    utmost    unlimited    heartfelt    unrestrained    inexhaustible    immeasurable    inordinate    unfailing    inexpressible