long-lost

long-lost

adj
1. not seen for a long time
2. lost for a long time
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Translations

long-lost

[ˈlɒŋˈlɒst] ADJperdido hace mucho tiempo
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

long-lost

[ˈlɒŋˈlɒst] adjperduto/a da tempo; (friend) → che non si vede da molto tempo
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in classic literature ?
All that I could comprehend of the particulars which Mow-Mow rehearsed to his audience as we proceeded, was that my long-lost companion had arrived in a boat which had just entered the bay.
They had only yielded thus far to my entreaties, that I might give a joyful welcome to my long-lost comrade; but now that it was known he had not arrived they would at once oblige me to turn back.
Those long-lost descendants of the ten tribes of Israel would now learn the history of their forefathers.
Leaving her infant with Loretto she rushed forward and threw herself upon her brother's neck, who clasped his long-lost sister to his heart with a warmth of affection but little compatible with the reputed stoicism of the savage.
When the wonderful tidings reached the ears of Queen Jinjur -- how Mombi the Witch had been captured; how she had confessed her crime to Glinda; and how the long-lost Princess Ozma had been discovered in no less a personage than the boy Tip -- she wept real tears of grief and despair.
The sweep's name was Sooty, and one day when they were playing near the well, Malcolm fell in and would have been drowned had not Sooty dived in and rescued him, and the water had washed Sooty clean and he now stood revealed as Malcolm's long-lost father.
And still, the darker it grew, the more persistently my portrait led me back to the past, the more vividly the long-lost image of the child Mary showed itself to me in my thoughts.
A tingling long-lost sense of pleasure often came across me during this journey.
"The nails of this white hand were still rosy, and the pose of the extended fingers seemed to express an eloquent welcome to the long-lost light of day."
No other prize I seek to gain, No triumph, glory, or success, Only the long-lost happiness, The memory whereof is pain.
Long Lost Family ITV, Mon 9pm Davina McCall and Nicky Campbell help more people to reunite with long-lost relatives.
CAYLEY Cox never gave up hope of seeing her long-lost brother again and her patience was rewarded in a thrilling way.