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treasonous

[tree-zuh-nuh s] /ˈtri zə nəs/
adjective
Origin of treasonous
1585-1595
First recorded in 1585-95; treason + -ous
Related forms
treasonously, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Word Origin and History for treasonous
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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