3 sentences

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

3. 由于缺乏监管，当地的盗猎行为愈发放肆。

   yóu​yú quē​fá jiān​guǎn, dāng​dì de dào​liè xíng​wéi yù​fā fàng​sì.

   Due to a lack of supervision, poaching in the area has become increasingly brazen.

   Source: Dong Chinese Dictionary