Answer: indescribable

AnswerCrossword Clue
INDESCRIBABLEBeyond expression
INDESCRIBABLEToo unusual for words
INDESCRIBABLEImpossible to put into words
indescribablethat cannot be described / something that cannot be described
indescribableToo unusual, extreme, or indefinite to be adequately described