A thing which cannot be expressed or described.
I found his performance to be confusing and, to tell the truth, totally ineffable.
She who cannot be effed
Dude she's way out of your league, totally ineffable.
Incapable of being expressed in words; unspeakable; unutterable; indescribable.
Not to be uttered; taboo.
We named our crew team's boat ineffable
1. Not able to be described with words.
2. Not sexually desirable.
Yo mama so ineffable.
Not fuckable for whatever reason
Jack is ineffable, as he's my boss.
Can not or, will not be expressed in words.
Crowley and Aziraphale are ineffable husbands.