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Webster 1913 Edition

Adj.

Pertaining to treason; consisting of treason; involving the crime of treason, or partaking of its guilt.

Most men’s heads had been intoxicated with imaginations of plots and

treasonable

practices.

Clarendon.

Syn. – Treacherous; traitorous; perfidious; insidious.

–

Trea′son-a-ble-ness

Noun.

–

Trea′son-a-bly

adv.

Adj.

tree'znable. Pertaining to treason; consisting of treason; involving the crime of treason, or partaking of its guilt.

Most men's heads had been intoxicated with imaginations of plots and treasonable practices.

treasonable ‎(comparative more treasonable, superlative most treasonable)