[tree-zuh-nuh s]
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Origin of treasonous

First recorded in 1585–95; treason + -ous
Related formstrea·son·ous·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for treasonous

mid-15c., from treason + -ous. Related: Treasonously.

Online Etymology Dictionary, © 2010 Douglas Harper