Meaning of unaccounted-for

un•ac•count•ed-for

Pronunciation: (un"u-koun'tid-fôr"), [key]
— adj.
  1. not accounted for; not understood; unexplained: an explosion resulting from some unaccounted-for mechanical failure.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.