Difficult or impossible to understand or comprehend; unintelligible.adjective
Impossible to know or fathom.adjective
Having no limits; boundless.noun
A thing or being that cannot be circumscribed within limits or that cannot be grasped by the intellect.
Not to be comprehended or comprised within limits; illimitable.
Not to be comprehended or understood; that cannot be grasped by the mind.
That is incomprehensible which may be known or believed as a fact, but of which the mode of existence or of operation, or of coming to pass, cannot be understood.adjective
Not capable of being contained within limits.adjective
Not capable of being comprehended or understood; beyond the reach of the human intellect; inconceivable.