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 match or equal; unsurpassed: matchless virtuosity at the keyboard.

adj. Having no match; without equal.

adj. Having no mate.

adj. Having no equal; unequaled.

adj. Unlike each other; unequal; unsuited.

Having no match or equal; peerless; unrivaled: as, matchless impudence; matchless charms.

Not matched; not paired; hence, unshared; having no partner.

Synonyms Unparalleled, incomparable, inimitable.

adj. eminent beyond or above comparison

"The same applies to the actual message of the work, the description of copulation, the nuptials of flowers in matchless bridal beds."

uncomparable    incomparable   

matchlessly    matchlessness   

unequaled    unequal    unsuited    nonpareil    unmatched    peerless    incomparable    unsurpassed    unparalleled    single   

incomparable    superhuman    unrivalled    unequalled    unparalleled    wondrous    marvellous    transcendent    peerless    inimitable