expression
nowhere to be seen; disappeared; vanished
Used when something or someone that was previously present or known is now gone or cannot be found; often carries a sense of sudden or mysterious disappearance.
さっきまであった財布がどこへやら消えてしまった。
The wallet that was here just a moment ago has disappeared into thin air.
彼の自信はどこへやら、今はすっかり落ち込んでいる。
His confidence is nowhere to be seen; now he's completely down.