treacherously

[ trech-er-uhs-lee ]

adverb

1. in a way characterized by faithlessness or betrayal; traitorously:

   Darius of Persia was treacherously wounded by two of his own officers.

2. in a way that is deceptive, untrustworthy, or unreliable:

   This peak looks treacherously easy, but it has seen a recurrence of avalanches.

3. in a way or to a degree that is dangerous; hazardously:

   He refused to go faster than 25 mph on the treacherously winding and narrow Wildwood Road.

Other Words From

• un·treach·er·ous·ly adverb

Word History and Origins

Origin of treacherously¹

treacherous ( def ) + -ly

Example Sentences

A storm blew in, drenching the stadium and making the shot put ring treacherously slippery.

From Los Angeles Times

The playing surface was treacherously slippy with snow piled up around up around the touchlines and conditions barely playable.

From BBC

“The Ukrainian military couldn’t penetrate our army’s defenses, but the top commander hit us in the back, treacherously and cowardly beheading the army at this most difficult moment.”

From Seattle Times

He said Friday he was ready for a compromise but “they have treacherously cheated us.”

From Los Angeles Times

In a statement late Friday, he said he was ready to find a compromise but “they have treacherously cheated us.”

From Washington Times