ineffable:
in⋅ef⋅fa⋅ble /ɪnˈɛfəbəl/ Spelled Pronunciation [in-ef-uh-buhl]
–adjective
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.
or perhaps: sublime
sub⋅lime /səˈblaɪm/ Spelled Pronunciation [suh-blahym]
adjective, noun, verb, -limed, -lim⋅ing.
–adjective
1. elevated or lofty in thought, language, etc.: Paradise Lost is sublime poetry.
2. impressing the mind with a sense of grandeur or power; inspiring awe, veneration, etc.: Switzerland has sublime scenery.
3. supreme or outstanding: a sublime dinner.
4. complete; absolute; utter: sublime stupidity.
5. Archaic.
a. of lofty bearing.
b. haughty.
6. Archaic. raised high; high up.
–noun
7. the sublime,
a. the realm of things that are sublime: the sublime in art.
b. the quality of sublimity.
c. the greatest or supreme degree.
–verb (used with object)
8. to make higher, nobler, or purer.
9. Chemistry.
a. to convert (a solid substance) by heat into a vapor, which on cooling condenses again to solid form, without apparent liquefaction.
b. to cause to be given off by this or some analogous process.
–verb (used without object)
10. Chemistry. to volatilize from the solid state to a gas, and then condense again as a solid without passing through the liquid state.
Origin:
1350–1400; (n. and adj.) < L sublīmis high, equiv. to sub- sub- + an element of uncert. orig., variously identified with līmis, līmus oblique or līmen lintel, threshold; (v.) ME sublimen < OF sublimer < L sublimāre to raise, deriv. of sublimis