The state of being opposite or reversed in direction or order. Also used as a prefix meaning 'opposite' or 'reverse'.
彼は服を逆さに着ていたので鏡の前で気づいた。
He was wearing his clothes inside out, so he noticed it in front of the mirror.
予想と逆の結果が出て驚いた。
I was surprised because the result came out opposite to expectations.
手順を逆の順序で行うともっと効率的になることがある。
Sometimes doing the steps in the reverse order is more efficient.
彼は流れに逆らって泳いだ。
He swam against the current.