treacherous
adjective
treach·er·ous
ˈtre-chə-rəs 
ˈtrech-rəs
1
a
: likely to betray trust : unreliable
a treacherous memory
b
: providing insecure footing or support
treacherous quicksand
c
: marked by hidden dangers, hazards, or perils
2
: characterized by or manifesting treachery : perfidious
treacherously
adverb
treacherousness
noun
Synonyms
Examples of treacherous in a Sentence
a treacherous act of betrayal
They were not prepared to hike over such treacherous terrain.
The snow made their hike all the more treacherous.
Discussions about money can lead couples into treacherous territory.
Recent Examples on the Web
Being a woman on this show has always been more treacherous than Miss Patricia’s one loop around the block in her Rolls-Royce.
—
Brian Moylan, Vulture, 6 Feb. 2025
Snowfall is expected to accumulate between 6 and 12 inches in eastern parts of the state, with Omaha and Lincoln experiencing treacherous conditions.
—Thomas G. Moukawsher, Newsweek, 5 Feb. 2025
Again, be cautious, as some roads in Tinos can be treacherous.
—Stacey Leasca, Travel + Leisure, 1 Feb. 2025
During combat and rescue operations, pilots often must navigate treacherous conditions under intense pressure; training flights designed to prepare them for those missions carry their own hazards, and some experts warn the risks have been growing in recent years.
—Mike Hixenbaugh, NBC News, 31 Jan. 2025
See all Example Sentences for treacherous 
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Brian Moylan, Vulture, 6 Feb. 2025
Snowfall is expected to accumulate between 6 and 12 inches in eastern parts of the state, with Omaha and Lincoln experiencing treacherous conditions.
—Thomas G. Moukawsher, Newsweek, 5 Feb. 2025
Again, be cautious, as some roads in Tinos can be treacherous.
—Stacey Leasca, Travel + Leisure, 1 Feb. 2025
During combat and rescue operations, pilots often must navigate treacherous conditions under intense pressure; training flights designed to prepare them for those missions carry their own hazards, and some experts warn the risks have been growing in recent years.
—Mike Hixenbaugh, NBC News, 31 Jan. 2025
See all Example Sentences for treacherous
Dictionary Entries Near treacherous
Cite this Entry
“Treacherous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/treacherous. Accessed 12 Feb. 2025.
Copy CitationKids Definition
treacherous
adjective
treach·er·ous
ˈtrech-(ə-)rəs
1
a
: guilty of treachery
b
: likely to betray : unreliable
a treacherous memory
2
: giving a false appearance of safety or solidity
a treacherous stretch of bog
treacherously
adverb
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