long-lost

1. Having been missing for a long time. A: "Are those my long-lost mittens?" B: "Yep, you must have left them in my car last year." Based on all the dust, that must be Billy's long-lost teddy bear.

2. Having not been seen for a long time. I can't believe my long-lost sister is coming for Thanksgiving. I haven't seen her in years!

See also:

for (so) long
for long
long gone
enjoy a long run
time out of mind
over the long term
a long time coming
go a long way
long green
long since

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