treasonous en · ADJ
Etymology
Etymology tree English treason Proto-Indo-European *h₃ed- Proto-Indo-European *-os Proto-Indo-European *h₃édosder.? Proto-Italic *-ŏ̄dsos? Old Latin -ōssus Latin -ōsus Old French -usbor. Middle English -ous English -ous English treasonous From treason + -ous.
Meanings
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(not-comparable) Like or in the way of treason.
His treasonous actions earned Benedict Arnold eternal scorn.
Deriveds
semitreasonous · treasonously · untreasonous · nontreasonous
Synonyms
false-hearted · traitorous · double-faced · unfaithful · guileful · reptitious · infidelitous · treachersome · dastardly · nonfaithful · swike · disloyal · illoyal · traitorlike · Judaslike · traitorly · unsteadfast · falseheart · Punic · double-dealing · viperous · double-hearted · double-crossing · booky · Judasly · unleal · insidious · viperish · untrue · recreant · doublehearted · proditorious · perfidious · dastardly · false · traitorous · guiled · traitorsome · faithless · traitorish · renegade · reptilian · proditory · treacherous · ratlike · unloyal · disleal · hollow-hearted · trothless · perfidious