Unthinkable

//ʌnˈθɪŋkəbəl// adj, noun

Definitions

Adjective
  1. 1
    That cannot be believed.

    "Near-synonyms: unbelievable, incredible, inconceivable"

  2. 2
    Inconceivable or unimaginable; extremely improbable in a way that goes against common sense.

    "Near-synonyms: inconceivable, imponderable"

  3. 3
    Extremely improper; extremely at odds with norms of expected behavior.

    "Near-synonyms: taboo, unspeakable, unutterable, inconceivable"

Adjective
  1. 1
    incapable of being conceived or considered wordnet
Noun
  1. 1
    Something, or various things collectively, that one dare not think about, dare not do, or dare not think about doing.

    "Near-synonym: unspeakable"

Etymology

Etymology 1

From un- + think + -able.

Etymology 2

From un- + think + -able.

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