Source : Webster's Revised Unabridged Dictionary (1913)

Beetle-browed \Bee"tle-browed`\, a. [OE. bitelbrowed; cf. OE.
   bitel, adj., sharp, projecting, n., a beetle. See {Beetle} an
   insect.]
   Having prominent, overhanging brows; hence, lowering or
   sullen.

   Note: The earlier meaning was, ``Having bushy or overhanging
         eyebrows.''

Source : WordNet®

beetle-browed
     adj : sullen or unfriendly in appearance [syn: {scowling}]