adjective
Etymology: from present participle of miss (I)
1. : not able to be found : not present : absent
missing in action
the missing part of the machine
an understanding of character is missing from the book
2. : absent without explanation from one's home or usual or expected place of resort
turned up missing in the morning and hasn't been seen since
the common-law principle that anyone who has been declared a missing person may, after seven years, be presumed dead — Time