inconceivable

Impossible to comprehend or grasp fully.

So unlikely or surprising as to have been thought impossible; unbelievable.

Incapable of being conceived, or realized in the imagination; incredible; inexplicable.

An expression which conveys no conception whatever, but is mere gibberish, is not called inconceivable, but unintelligible. The word inconceivable (see also unconceivable) is used in the following senses in philosophy: Involving a contradiction in terms, such as the idea of a non-existent being.

Unacceptable to the mind because involving a violation of laws believed to be well established by positive evidence, as a perpetual motion.

Unimaginable by man on account of an inseparable association, although not perhaps involving any contradiction nor even physically impossible, as the perception of color without extension.

Unimaginable to a particular person from novelty, as the idea that parallel straight lines meet at infinity.

Capable of being conceived only by a negative or relaive notion, such as the idea of infinity.

Incredible; not to be imagined as believed in by any man, as the supposition of an event undetermined by a cause.

Not conceivable; incapable of being conceived by the mind; not explicable by the human intellect, or by any known principles or agencies; incomprehensible.