疎い

貴様は階級に疎いな

You don't know much about ranks, do you?

— 続・夕陽のガンマン (1966)

トムはスポーツには疎い。

Tom doesn't know much about sports.

音楽もユーモアも―両方に疎いね

You're clueless about both music and humor.

— 最強のふたり (2011)

音楽に疎いね

You don’t know much about music.

— 最強のふたり (2011)

僕は最近の情勢に疎い。

I'm not very familiar with recent developments.