What is the opposite of avuncular?

The opposite of avuncular, which means "resembling an uncle in kindness or indulgence," depends on what aspect you want to contrast:

For kindness/indulgence:

* Harsh

* Strict

* Uncaring

* Cold

* Unforgiving

* Cruel

For resembling an uncle:

* Maternal (resembling a mother)

* Paternal (resembling a father)

* Sibling-like

* Peer-like

The best opposite will depend on the specific context in which you are using the word "avuncular."