2 sentences

1. 他对他人的批评表现得毫不在意。

   tā duì tā​rén de pī​píng biǎo​xiàn de háo bù​zài​yì.

   He seemed completely indifferent to others' criticism.

   Source: Dong Chinese Dictionary

2. 他说话大大咧咧的，从不在意细节。

   tā shuō​huà dà​dà​liē​liē de, cóng bù​zài​yì xì​jié.

   He is very casual in his speech and never pays attention to details.

   Source: Dong Chinese Dictionary