Source : Webster's Revised Unabridged Dictionary (1913)

Trustworthy \Trust"wor`thy\, a.
   Worthy of trust or confidence; trusty. --
   {Trust"wor`thi*ness}, n.

Source : WordNet®

trustworthy
     adj 1: worthy of trust or belief; "a trustworthy report"; "an
            experienced and trustworthy traveling companion" [syn:
             {trusty}] [ant: {untrustworthy}]
     2: taking responsibility for one's conduct and obligations;
        "trustworthy public servants"