Definition from macmillandictionary.com
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We’re well and truly lost.
They decided to drive to York and ended up getting lost.
The keys are lost somewhere in the house.
The strike has cost the airline £3 million in lost revenue.
a poem about lost innocence
The team’s season has been littered with missed opportunities and lost chances.
Mark looked a little lost amongst all those trendy designers.
Nothing was the same any more. I felt lost.
The group is working to preserve old buildings that could otherwise be lost.
a memorial to all soldiers lost in battle
a ceremony to commemorate those lost at sea in the Second World War
Grayson became lost in the music.
Martin was lost in thought and did not hear the door open.
Look at them watching their video. Completely lost to the world!
I was completely lost after the first paragraph.