avuncular
/əˈvʌŋkjʊlə(r)/adjective
1
- kind and friendly towards a younger or less experienced person（对年轻人或阅历浅的人）友好的; 亲切的：
an avuncular manner.
友善的态度。
2
- Anthropology of or relating to the relationship between men and their siblings' children【人类学】（有关）叔侄（或舅甥）关系的。
词源
mid 19th cent.: from Latin avunculus 'maternal uncle'， diminutive of avus 'grandfather'.