A wrong guess or off-target estimate; misdirected or irrelevant — used when an opinion or guess misses the point.
君の言っていることは見当違いだ。問題はそこではない。
What you're saying is off the mark. The problem isn't there.
見当違いの批判は議論を深めない。
Off-target criticism doesn't deepen the discussion.
彼の推測は見当違いで、証拠と合わなかった。
His guess was wrong and did not match the evidence.