2 sentences for 放肆 (fàng​sì — impudent)

1. 他在长辈面前说话太放肆了。

   tā zài zhǎng​bèi miàn​qián shuō​huà tài fàng​sì le.

   He speaks too insolently in front of his elders.

   Source: Dong Chinese Dictionary

2. 他在公共场合表现得非常放肆。

   tā zài gōng​gòng chǎng​hé biǎo​xiàn de fēi​cháng fàng​sì.

   He behaved very insolently in public.

   Source: Dong Chinese Dictionary