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

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adj. Incapable of being expressed; indescribable or unutterable. See Synonyms at unspeakable.

adj. Not to be uttered; taboo: the ineffable name of God.

adj. Beyond expression in words; unspeakable.

adj. Forbidden to be uttered; taboo.

adj. Incapable of being expressed in words; unspeakable; unutterable; indescribable.

Incapable of being expressed in words; unspeakable; unutterable; inexpressible: as, the ineffable joys of heaven; ineffable disgust.

That must not be spoken: as, the ineffable name. See Jehovah.

n. plural Trousers.

n. One who is not to be named; one who is too high in his profession or in the fashionable world to be named with others.

adj. too sacred to be uttered

adj. defying expression or description

"Something about the plastic face, a face frozen in an expression of ineffable sadness."

sacred    unexpressible    inexpressible   

unspeakable    unutterable    indescribable    inexpressibl    inexpressible    taboo   

inexpressible    heavenly    infinite    indefinable    inward    unearthly    boundless    transcendent    incomparable    womanly