treacherous
word
Definition
Describes something or someone that is dangerously unstable, unsafe, or likely to betray trust; can mean both physically dangerous or deceitful.
Usage & Nuances
'Treacherous' is often formal or literary. Common with roads, weather, people, or actions ('treacherous friend', 'treacherous path'). The word can mean physically dangerous (like ice on a road) or morally deceitful (like betrayal). Do not confuse with just 'dangerous'—'treacherous' has an extra idea of betrayal or unpredictability.
Example Sentences
This mountain path is very treacherous.
basic
Be careful, the ice is treacherous today.
basic
He is a treacherous man who cannot be trusted.
basic
The river looks calm, but the current is actually treacherous.
natural
Watch out for that guy—he has a treacherous reputation.
natural
The weather turned treacherous overnight, making travel impossible.
natural