unthinkable

adjective/ʌnˈθɪŋkəbəl/

Frequency rank: #9,901 most common English word

Meaning

Too unlikely or undesirable to be considered possible; inconceivable.

Illustration for the English word “unthinkable”

Example sentence

Just a century ago, flying across the ocean was considered completely unthinkable.

Synonyms & related words

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