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ineffable-adjective  /ɪnˈɛfəbəl/ Pronunciation Key - Show Spelled Pronunciation[in-ef-uh-buhl]
1. incapable of being expressed or described in words; inexpressible: ineffable joy.
2. not to be spoken because of its sacredness; unutterable: the ineffable name of the deity.

http://dictionary.reference.com/browse/ineffable

The small child's sorrow was ineffable when her rabbit died; not even crying seemed enough to express it.