Found 2 items, similar to treasonous.
English → English (WordNet) Definition: treasonous treasonous adj : constituting treason; “a traitorous act”; “treasonable acts like sabotage” [syn: traitorous, treasonable]
English → English (gcide) Definition: Treasonous Treasonous \Trea"son*ous\, a. Treasonable. --Shak. [1913 Webster] The treasonous book of the Court of King James. --Pepys. [1913 Webster]