We don't have any synonyms for something missing yet.
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Definition of something missing:
(n) :
an unspecified
object; an
event that breaks up a period of calm
"I must have forgotten to pack something, but I can't think of what."
(v) :
somewhat; to a
degree; applied to an action whose name is forgotten by, unknown or unimportant to the user, e.g. from words of a song
"the baby looks something like his father."