Source : Webster's Revised Unabridged Dictionary (1913)

Adumbrate \Ad*um"brate\, v. t. [L. adumbratus, p. p. of
   adumbrare; ad + umbrare to shade; umbra shadow.]
   1. To give a faint shadow or slight representation of; to
      outline; to shadow forth.

            Both in the vastness and the richness of the visible
            universe the invisible God is adumbrated. --L.
                                                  Taylor.

   2. To overshadow; to shade.

Source : WordNet®

adumbrate
     v 1: describe roughly or briefly or give the main points or
          summary of; "sketch the outline of the book"; "outline
          his ideas" [syn: {sketch}, {outline}]
     2: give to understand; "I insinuated that I did not like his
        wife" [syn: {intimate}, {insinuate}]