in a way that does not feel comfortable and pleasant

I was warm but not uncomfortably so. 我很暖和，也没有什么不舒服。

She lay awkwardly on her back, shifting uncomfortably, unable to sleep. 她局促地仰面躺着，不舒服地转动身体，无法入睡。

in a way that makes you feel slightly embarrassed, or that shows that you feel slightly embarrassed

She glanced away uncomfortably, staring down at her plate. 她不安地移开了目光，转而紧盯着自己面前的盘子。

I smiled uncomfortably while he processed my information. 他审读我的履历时，我尴尬地在一边赔笑。