chancer noun, British
a person who dexterously and expediently changes or adopts opinions <a two-faced chancer, he doesn't hesitate to dump people when they are no longer of any use>
one who does things only for his own benefit and with little regard for right and wrong <betrayed by a chancer who, she mistakenly thought, was her friend>
Seen & Heard
What made you want to look up chancer? Please tell us where you read or heard it (including the quote, if possible).