Definition of lost
1
: not made use of, won, or claimed
- a lost opportunity
2 a
: no longer possessed
- a lost reputation
b
: no longer known
- a lost tunnel
3
: ruined or destroyed physically or morally : desperate
- a lost soul
4 a
: taken away or beyond reach or attainment : denied
- regions lost to the faith
b
: insensible, hardened
- lost to shame
5 a
: unable to find the way
b
: no longer visible
- lost in the crowd
c
: lacking assurance or self-confidence : helpless
- lost without his glasses
7
: not appreciated or understood : wasted
- their jokes were lost on me
8
: obscured or overlooked during a process or activity
- lost in translation
9
: hopelessly unattainable : futile
- a lost cause
