他丝毫没有发现我的存在。

Tā sīháo méiyǒu fāxiàn wǒ de cúnzài.

He didn't notice my presence at all.

他丝毫不在乎我的意见。

Tā sīháo bù zàihū wǒ de yìjiàn.

He doesn't care at all about my opinion.

她对他的批评丝毫不介意。

Tā duì tā de pīpíng sīháo bù jièyì.

She doesn't mind his criticism at all.