[tree-zuh-nuh-buh l]
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Origin of treasonable

First recorded in 1325–75, treasonable is from the Middle English word tresonabill. See treason, able
Related formstrea·son·a·bly, adverbnon·trea·son·a·ble, adjectivenon·trea·son·a·ble·ness, nounnon·trea·son·a·bly, adverbun·trea·son·a·ble, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for treasonable

Historical Examples of treasonable