I'm not too sure if this hint point exactly to the word, just tell me if it's too hard, ok ?
"Out of sight, yet on your mind,
A place you seek, but cannot find.
It lies beyond, not here to stay,
A fleeting thought that drifts away."
https://framedl.xyz/?cw=b3645e55-a1b1-450a-9b19-f4e57fc0484f