1. [adj]  not prominent or readily noticeable; "he pushed the string through an inconspicuous hole"; "the invisible man"
2. [adj]  impossible or nearly impossible to see; imperceptible by the eye; "the invisible man"; "invisible rays"; "an invisible hinge"; "invisible mending"

Invisible
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1. \In*vis"i*ble\, a. [F. invisible, L. invisibilis. See
   {In-} not, and {Visible}.]
   Incapable of being seen; not perceptible by vision; not
   visible.
         To us invisible, or dimly seen In these thy lowest
         works.                                   --Milton.
   {Invisible bird} (Zo["o]l.), a small, shy singing bird
      ({Myadestes sibilons}), of St. Vincent Islands.
   {Invisible green}, a very dark shade of green, approaching to
      black, and liable to be mistaken for it.
   

2. \In*vis"i*ble\, n.
   1. An invisible person or thing; specifically, God, the
      Supreme Being.
   2. A Rosicrucian; -- so called because avoiding declaration
      of his craft. [Obs.]
   3. (Eccl. Hist.) One of those (as in the 16th century) who
      denied the visibility of the church. --Shipley.