You use long-lost to describe someone or something that you have not seen for a long time. finding a long-lost sixth century manuscript. lost or not seen for a long time
long lost
الواصلة
Long lost
التركية النطق
lông lôst
النطق
/ˈlôɴɢ ˈlôst/ /ˈlɔːŋ ˈlɔːst/
علم أصول الكلمات
[ 'lo[ng] ] (adjective.) before 12th century. Middle English long, lang, from Old English; akin to Old High German lang long, Latin longus.