2 sentences for 无意 (wú​yì — inadvertent)

1. 他无意中收到了一张假币。

   tā wú​yì zhōng shōu​dào le yī zhāng jiǎ​bì.

   He unintentionally received a counterfeit coin.

   Source: Dong Chinese Dictionary

2. 这次失误纯属无意，希望你不要放在心上。

   zhè cì shī​wù chún​shǔ wú​yì, xī​wàng nǐ bù yào fàng zài xīn shàng.

   This mistake was completely unintentional; I hope you won't take it to heart.

   Source: Dong Chinese Dictionary