unthinkable.
That cannot be believed.
Meaning & usage
That cannot be believed.
Inconceivable or unimaginable; extremely improbable in a way that goes against common sense.
Extremely improper; extremely at odds with norms of expected behavior.
Where this word comes from
Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- Proto-Indo-European *teng-der. Proto-Germanic *þankijaną Proto-West Germanic *þankijan Old English þenċan Middle English thinken English think Proto-Indo-European *-dʰlom Proto-Italic *-ðlom Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English unthinkable From un- + think + -able.
Something, or various things collectively, that one dares not think about or do.
do the unthinkable
did the unthinkable
Where this word comes from
Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- Proto-Indo-European *teng-der. Proto-Germanic *þankijaną Proto-West Germanic *þankijan Old English þenċan Middle English thinken English think Proto-Indo-European *-dʰlom Proto-Italic *-ðlom Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English unthinkable From un- + think + -able.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.