indescribable
[adjective]
Synonyms: unutterable, beyond description, beyond words, indefinable, inexpressible

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Antonyms: describable

[TahlilGaran] English Synonym Dictionary ▲

in‧de‧scri‧ba‧ble /ˌɪndɪˈskraɪbəbəl◂/ adjective
[Word Family: adjective: describable ≠ indescribable, nondescript, descriptive; verb: describe; noun: description; adverb: descriptively]
something that is indescribable is so terrible, so good, so strange etc that you cannot describe it, or it is too difficult to describe:
a feeling of indescribable joy
—indescribably adverb:
an indescribably awful smell

[TahlilGaran] Dictionary of Contemporary English ▲