3 sentences

1. 他无端地对我发脾气。

   tā wú​duān de duì wǒ fā pí​qi.

   He lost his temper with me for no reason.

   Source: Dong Chinese Dictionary

2. 你不能那样无端指责我。

   nǐ bù néng nà​yàng wú​duān zhǐ​zé wǒ.

   You can't just accuse me of something like that.

   Source: OpenSubtitles

3. 总统不会宽恕任何无端惹怒美国人的行为。

   zǒng​tǒng bù huì kuān​shù rèn​hé wú​duān rě​nù Měi​guó​rén de xíng​wéi.

   The president will not condone anything that antagonizes the Americans unnecessarily.

   Source: OpenSubtitles