ineffable
adjective
[ ɪnˈɛfəb(ə)l ]
• too great or extreme to be expressed or described in words.
• "the ineffable mysteries of the soul"
Similar:
inexpressible,
indescribable,
beyond words,
beyond description,
beggaring description,
undefinable,
unutterable,
untold,
unheard of,
unthought of,
unimaginable,
overwhelming,
marvellous,
wonderful,
breathtaking,
staggering,
astounding,
amazing,
astonishing,
fantastic,
fabulous,
not to be uttered,
not to be spoken,
not to be said,
unmentionable,
taboo,
forbidden,
off limits,
out of bounds,
no go,
Origin:
late Middle English: from Old French, or from Latin ineffabilis, from in- ‘not’ + effabilis (see effable).