The word 'undescribable' is correct and usable in written English.
It is an adjective which means impossible to describe. For example: The beauty of the Grand Canyon is undescribable.
"This feeling, to be on the best team of the world, is just undescribable," Nowitzki said, a championship hat askew on his head, a soaked T-shirt on his chest and medical tape still wrapped around his torn left middle finger, which was injured in Game 2. In his hands was the box score, which showed Nowitzki with 21 points and 11 rebounds on the biggest night of his 13-year career.
"Just the feeling to be on the best team of the world is just undescribable," Nowitzki said.
It's an undescribable feeling.
Introducing Waits, Neil Young said the singer is "undescribable, and I'm here to describe him".
Year after year, he opened the doors of Radio 1 to artists who were uncommercial, under-financed, under the radar or just downright undescribable.
I think I speak for all staff at Air Products across the world in expressing our profound sympathy for the family of the victim of this undescribable act," Ghasemi said.
The relief when he rang on Tuesday to let me know he was safe was undescribable.
He is burdened by an "undescribable feud" and a sense of tension caused by the loss of the sculptures' identity when transplanted to an English museum.
Modern philosophers in the grip of the simple picture (see 2 above) tended toward the limit of supposing pleasure a simple and undescribable feeling in momentary consciousness and nothing more.
The fact that neuronal assemblies are mostly described in terms of classical behavior does not rule out that classically undescribable quantum effects may be significant if one focuses on individual constituents of assemblies, i.e., single neurons or interfaces between them.
