the word 'treasonable' is built upon the noun 'treason', which carries the core meaning of betrayal. this noun entered english from old french, tracing its lineage back to the latin verb 'tradere', meaning "to hand over" or "to deliver". the suffix '-able', of latin origin, is attached to form an adjective, indicating the quality or capacity related to the noun. thus, the literal construction "capable of treason" evolved into the modern legal and political sense, describing acts or persons that constitute or are characteristic of the betrayal of one's sovereign or nation.

Structure: treason (noun) + able (adjective suffix) 'treason' (from old french traïson, ultimately from latin traditionem, meaning "a handing over, betrayal"). 'able' (from latin -abilis, a suffix forming adjectives meaning "capable of, fit for, tending to").