long-lost
adjective/ˈlɒŋ lɒst/
/ˈlɔːŋ lɔːst/
[only before noun]- that you have not seen or received any news of for a long time
长时间没见面的；杳无音信的 - a long-lost friend
长久没有音信的朋友
Oxford Collocations DictionaryLong-lost is used with these nouns:- brother
- cousin
- daughter
- …
- a long-lost friend