no one will be (any) the wiser

no one will be (any) the wiser

No one will notice if someone does something, especially that which is self-serving, mischievous, or immoral. Come have a cigarette with us! Just eat some mints, then wash your hands and face and no one will be any the wiser! He'd been stealing tiny amounts from everyone in the office so that no one was the wiser.
See also: one, will, wiser
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