← BackshareGuessdinkum/ˈdɪŋkəm/adjectiveGenuine, honest, or authentic; often used in Australian and New Zealand English.She gave a dinkum apology for her mistake.He's a dinkum bloke who always keeps his promises.That's a dinkum antique, not a cheap copy.SynonymsauthentichonestgenuineAntonymsphonyfake