5 sentences

1. 他忠贞不渝，绝无贰心。

   tā zhōng​zhēn bù​yú, jué wú èr xīn.

   He is faithful and unswerving, with no divided loyalty.

   Source: Dong Chinese Dictionary

2. 我从没说自己是忠贞的。

   wǒ cóng méi shuō zì​jǐ shì zhōng​zhēn de.

   I never said I was faithful.

   Source: OpenSubtitles

3. 屈原常以香草喻指忠贞的臣子。

   Qū Yuán cháng yǐ xiāng​cǎo yù​zhǐ zhōng​zhēn de chén​zǐ.

   Qu Yuan often used fragrant herbs as a metaphor for loyal ministers.

   Source: Dong Chinese Dictionary

4. 他对国家和事业始终保持着忠贞。

   tā duì guó​jiā hé shì​yè shǐ​zhōng bǎo​chí zhe zhōng​zhēn.

   He has always remained faithful to the country and his cause.

   Source: Dong Chinese Dictionary

5. 他在极端困难的条件下依然保持着忠贞。

   tā zài jí​duān kùn​nan de tiáo​jiàn xià yī​rán bǎo​chí zhe zhōng​zhēn.

   He remained loyal and steadfast even under extremely difficult conditions.

   Source: Dong Chinese Dictionary