Synonyms of treasonable

2 Syllables
disloyal, untrue, recreant, betraying, faithless
3 Syllables
traitorous, mutinous, wormlike, treacherous, two-faced, two-timing, foresworn, perfidious, treasonous, scoundrelly, unfaithful, moonlighting, seditious, rebellious
4 Syllables
falsehearted, unpatriotic, mythomaniac, undutiful, double-crossing, apostate, subversive
5 Syllables
adulterine
6 Syllables
insubordinate