Synonyms for Treacherously:

• adv

  •falsely (adverb)
  • disloyally,
  • behind ones back,
  • perfidiously.

• adv.

  •dangerously (adverb)
  • hazardously,
  • unsafely,
  • threateningly,
  • menacingly,
  • perilously,
  • ominously,
  • dangerously.
  •dishonestly (adverb)
  • deviously,
  • hypocritically,
  • fraudulently,
  • immorally,
  • corruptly,
  • unscrupulously,
  • crookedly,
  • craftily,
  • deceitfully,
  • feloniously,
  • insincerely,
  • dishonorably,
  • underhandedly.
  •disobediently (adverb)
  • rebelliously,
  • subversively,
  • seditiously,
  • factiously,
  • mutinously,
  • insubordinately,
  • disobediently.
  •falsely (adverb)
  • maliciously,
  • roguishly,
  • treacherously,
  • behind one's back,
  • unfaithfully,
  • falseheartedly,
  • basely,
  • malevolently.
  •treacherously (adverb)
  • Difficultly,
  • chancily.

• n.

  •false (noun)
  • false.

• Other synonyms:

  •
  • untruthfully.
  •Other relevant words:
  • precariously,
  • deceptively,
  • untrustworthily,
  • furtively,
  • misleadingly,
  • riskily,
  • privately,
  • unreliably,
  • sneakily,
  • Hollowly,
  • treasonably,
  • insidiously,
  • guilefully,
  • deceivingly,
  • indirectly,
  • rottenly,
  • Traitorly,
  • trickily,
  • unstably,
  • slyly,
  • secretly,
  • recreantly,
  • insecurely,
  • clandestinely,
  • back,
  • untruly,
  • shakily,
  • surreptitiously,
  • meanly.

Antonyms for Treacherously:

• adv.

  • falsely
    truthfully.
  • treacherously
    harmlessly, safely, faithfully, loyally, honestly.