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1. Impossible to comprehend or grasp fully: inconceivable folly; an inconceivable disaster.
2. So unlikely or surprising as to have been thought impossible; unbelievable: an inconceivable victory against all odds.

in′con·ceiv′a·bil′i·ty, in′con·ceiv′a·ble·ness n.
in′con·ceiv′a·bly adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.inconceivability - the state of being impossible to conceive
impossibility, impossibleness - incapability of existing or occurring
References in periodicals archive ?
Berkeley on Inconceivability and Impossibility, THOMAS HOLDEN
Anselm does not speak of material presence in the Proslogion; he speaks of inconceivability. The being whose greatness limits of my world must also transcend it.
"Radical Worlds: The Anthropology of Incommensurability and Inconceivability." Annual Review of Anthropology 30: 319-34.
Behind him unexpectedness, incomprehensibility, inconceivability. Another question--are they all there?
(16) The constraints on predictability, the ubiquity of uncertainty and the growing domains of inconceivability are imposing strict limits to the ambitions of planning and dictating some of its principal features.
Other, stricter definitions include aspects such as heuristic task, unusualness or unexpectedness, and sometimes even inconceivability, of the solution.
of the formal change but also the utter inconceivability, in contrast
The inconceivability of choices such as communal living, celibacy, and mass suicide render these groups fascinating and terrifying.