Simple Definition of treacherous
: not able to be trusted : showing that someone cannot be trusted
: very dangerous and difficult to deal with
Full Definition of treacherous
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.
First Known Use of treacherous
Synonym Discussion of treacherous
TREACHEROUS Defined for Kids
Definition of treacherous for Students
1 : not safe because of hidden dangers <This was a treacherous road at night … — John Reynolds Gardiner, Stone Fox>
2 : not trustworthy : guilty of betrayal or likely to betray <a treacherous enemy>
Seen and Heard
What made you want to look up treacherous? Please tell us where you read or heard it (including the quote, if possible).