他在公开演讲时总是不自信，害怕犯错。

He always feels ___insecure when giving public speeches, afraid of making mistakes.

这张摇晃的椅子让人坐上去感觉不安全。

The wobbly chair feels ___insecure to sit on.

独自在陌生的城市旅行可能会让人感到不安全。

Traveling alone in an unfamiliar city can make you feel ___insecure.