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English

Etymology

From Middle English undoutable, undoutabil, equivalent to un- +‎ doubtable.

Adjective

undoubtable (not comparable)

  1. (rare) Incapable of being doubted; undoubted; indubitable.
    • 1904, John Galsworthy, chapter 20, in The Island Pharisees:
      Her undoubtable quality had a non-individual flavour, as if standing for her class.

Derived terms

References