long-lost

adjective

: lost a long time ago : not seen or found for many years

a long-lost masterpiece that has recently been rediscovered

He embraced his old friend like a long-lost brother.

Examples of long-lost in a Sentence

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For most of us, this means putting away the outerwear and thermal layers and returning to our long-lost—but no less beloved—statement tees, day dresses, and sandals. —