Это слово также может быть формой:
прилагательное “lost”
 основа lost (more/most)
- заблудившийся
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 After several hours of wandering in the dense woods, they realized they were lost and had no way to contact help.
 - пропавший
I've searched everywhere for my passport, but it seems to be lost; I might have left it at the hotel.
 - сбитый с толку
The math professor spoke so quickly that many students were completely lost by the end of the lecture.
 - погружённый (в мысли)
Sitting by the window, she was so lost in her thoughts about the future that she didn't notice the storm approaching.
 - утраченный
Looking through old photographs, he felt a pang of nostalgia for his lost youth and carefree days.
 - потраченный впустую
We spent too much time debating, and now our chance to win the contract is lost.