Webster's English Dictionary

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ineffable

in.ef.fa.ble \(')in-'ef-*-b*l\ \-ble-\ aj [ME, fr. MF, fr. L ineffabilis, 
   fr. in- + effabilis capable o]f being expressed, fr. effari to speak out, 
   fr. ex- + fari to speak - more at BAN 1a: incapable of being expressed in 
   words : INDESCRIBABLE {~)R joy} 1b: UNSPEAKABLE {~ disgust}  2: not to be 
   uttered : TABOO {the ~ name of Jehovah}  - in.ef.fa.ble.ness n