Meaning & use
betrayer
A person who is disloyal to someone's trust, often by helping their enemies or revealing secrets.
See it in a sentence
The novel's betrayer turns out to be the hero's closest childhood friend.
History remembers him as a betrayer who sold military secrets to a rival nation.
A note on using this word
Betrayer is a fairly formal or literary word; 'traitor' is far more common in everyday speech.
Words with a similar meaning
traitorturncoat
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
Make it your own
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