Definition: 1 : of or relating to an uncle 2 : suggestive of an uncle especially in kindliness or geniality

Quotation: “The young nephew he had warmly clasped to his bosom and who had promised to be guided by his avuncular wisdom had deserted him as soon as it suited his purpose to do so.” from In the Lion’s Court: Power, Ambition, and Sudden Death in the Reign of Henry VIII

Another good word for showing off newfound vocabulary skills. And it rolls nicely off the tongue to boot.