Part of speech:
That cannot be defined
Impossible to pronounce:
Too overwhelming to be expressed or described in words; inexpressible
Find another word for inexpressible. In this page you can discover 13 synonyms, antonyms, idiomatic expressions, and related words for inexpressible, like: unspeakable, indefinable, indescribable, unutterable, impossible, incommunicable, ineffable, undescribable, beyond description (or words), defying description and words.