You're insecure about what you're doing.

你对自己所做的事没把握。

youdao

If you're out of shape, you'll feel insecure, unattractive, and less energetic.

如果你体态不出众，你会觉得不安全，没有吸引力并且缺少活力。

youdao

Clearly, you can't have a secure program if you're depending on other components in an insecure way.

显然，如果您使用一种不安全的方法依赖其他组件，就不可能获得安全的程序。

youdao

By contrast, if you touch your neck or cover the dimple at the base of it, you're saying you are uncomfortable, insecure or concerned.

FORBES: Business Basics