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Definitions

treacherous

[trech-er-uhs] / ˈtrɛtʃ ər əs /
ADJECTIVE
dishonest, disloyal
Synonyms
STRONGEST
slippery tricky unreliable
WEAK
betraying catchy deceitful deceptive double-crossing double-dealing duplicitous faithless false false-hearted fly-by-night insidious misleading perfidious recreant shifty slick snake in the grass traitorous treasonable two-faced two-timing undependable unfaithful unloyal untrue untrustworthy
Antonyms
STRONGEST
honest reliable
WEAK
forthright harmless loyal true untreacherous
ADJECTIVE
dangerous
Synonyms
STRONGEST
difficult hazardous icy ominous perilous precarious risky slippery ticklish tricky unreliable unsafe unstable
WEAK
alarming chancy deceptive dissembled faulty hairy insecure jeopardous menacing misleading shaky undependable unhealthy unsound wicked
Antonyms
STRONGEST
certain definite easy friendly honest protected reliable safe secure stable straightforward strong sure uncomplicated
WEAK
forthright harmless loyal true untreacherous

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In retrospect, its uncompromising litmus tests and chilly demeanor were real weaknesses, creating a pervading fear that any false step could expel one from good graces, and that a return trip was always, always treacherous.

From Slate • Apr. 13, 2026

Answering that question is more treacherous than usual.

From The Wall Street Journal • Apr. 1, 2026

“Sharply reduced visibility will make travel extremely treacherous across these areas.”

From Barron's • Feb. 22, 2026

Tuesday, setting off a challenging rescue operation in treacherous, remote, freezing conditions, eventually reaching the six survivors around 5:30 p.m.

From Los Angeles Times • Feb. 19, 2026

At the next building, there was no plank at all, only a treacherous crevice that plunged into the alley below.

From "The City Beautiful" by Aden Polydoros

Vocabulary lists containing treacherous

List 2

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