wrong (guess or estimate); misdirected; irrelevant; off the point
それは見当違いな批判だ。
That is an irrelevant criticism.
彼の指摘は、全く見当違いです。
His point is completely off the mark.
彼の反論は、完全に議論から見当違いの類だ。
His rebuttal is completely irrelevant to the discussion.