A Dictionary of the Older Scottish Tongue (up to 1700)
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First published 2002 (DOST Vol. XI).
Unquestionable, adj. [17th c. Eng. vnquestionable (1603); Questiounabill adj.] That is not open to question, indisputable. — 1700 D. Hume Accompt of Estate App. 98.
It is nottour that the said Sir David Home is a person of eminent and unquestionable integrity
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"Unquestionable adj.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 18 Aug 2022 <http://www.dsl.ac.uk/entry/dost/unquestionable>