Source : Webster's Revised Unabridged Dictionary (1913)

Trepid \Trep"id\, a. [L. trepidus.]
   Trembling; quaking. --Thackeray.

Source : WordNet®

trepid
     adj : timid by nature or revealing timidity; "timorous little
           mouse"; "in a timorous tone"; "cast fearful glances at
           the large dog" [syn: {fearful}, {timorous}]