| forfeit(adjective, confused, hidden, lost) |
| misplaced(verb, confused, hidden, lost) |
| gone(confused, hidden, lost, missing) |
| irretrievable(confused, hidden, lost, missing) |
| missed(confused, hidden, lost, missing) |
| out the window(expression, idiom, hidden, missing) |
| absent(confused, hidden, lost, unchangeable) |
| adrift(confused, hidden, lost, missing) |
| astray(confused, hidden, lost, unchangeable) |
| at sea(expression, hidden, lost, missing) |
| cast away(expression, hidden, lost, missing) |
| disappeared(confused, hidden, lost, unchangeable) |
| disoriented(confused, hidden, lost, missing) |
| down the drain(expression, idiom, hidden, missing) |
| fallen between cracks(expression, idiom, hidden, missing) |
| gone astray(expression, hidden, lost, missing) |
| hidden(confused, lost, unchangeable, missing) |
| invisible(confused, hidden, lost, unchangeable) |
| irrecoverable(confused, hidden, lost, missing) |
| irrevocable(confused, hidden, lost, missing) |