C2 adjective /ʌnˈʌtərəbl/
unutterable
अवर्णनीय
Meaning
Too great, intense, or awful to be expressed or described in words.
Example
She was filled with unutterable joy at the news of her success.
वह अपनी सफलता की खबर पर अवर्णनीय खुशी से भर गई थी।