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unable to read the situation; unable to pick up on the mood (e.g. of a conversation); unable to read the room
彼は空気読めないタイプだ。
He's the type who can't read the room.
空気読めない発言をしてしまった。
I made a comment without reading the room.
空気読めないと言われる。
I'm told I can't read the room.