3 sentences

1. 所有检测都是无痛的。

   suǒ​yǒu jiǎn​cè dōu shì wú​tòng de.

   All tests are painless.

   Source: CCMatrix

2. 这个过程是近乎无痛的。

   zhè​ge guò​chéng shì jìn​hū wú​tòng de.

   The process is nearly painless.

   Source: CCMatrix

3. 这个过程是完全安全和无痛的。

   zhè​ge guò​chéng shì wán​quán ān​quán hé wú​tòng de.

   This process is completely safe and painless.

   Source: CCMatrix