2 sentences

1. 别说言不由衷的话。

   bié shuō yán​bù​yóu​zhōng de huà.

   Don't say things you don't mean.

   Source: OpenSubtitles

2. 他这番话听起来完全是言不由衷。

   tā zhè fān huà tīng qi​lai wán​quán shì yán​bù​yóu​zhōng.

   His words sounded completely insincere.

   Source: Dong Chinese Dictionary