生疏 (shēng shū): Not familiar (Adjective) — Meaning & Stroke Order

Are you feeling a bit unfamiliar with how to use this new software?

After moving to the new city, I'm still unfamiliar with the roads here.

He is not unfamiliar with this kind of social situation; he's just not in good form today.

Due to not practicing for many years, his spoken English has become quite rusty.