The Collaborative International Dictionary of English v.0.48:

Cowardly \Cow"ard*ly\, a.
   1. Wanting courage; basely or weakly timid or fearful;
      pusillanimous; spiritless.
      [1913 Webster]

            The cowardly rascals that ran from the battle.
                                                  --Shak.
      [1913 Webster]

   2. Proceeding from fear of danger or other consequences;
      befitting a coward; dastardly; base; as, cowardly
      malignity. --Macaulay.
      [1913 Webster]

            The cowardly rashness of those who dare not look
            danger in the face.                   --Burke.

   Syn: Timid; fearful; timorous; dastardly; pusillanimous;
        recreant; craven; faint-hearted; chicken-hearted;
        white-livered.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cowardly \Cow"ard*ly\, adv.
   In the manner of a coward. --Spenser.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cowardly
    adj 1: lacking courage; ignobly timid and faint-hearted;
           "cowardly dogs, ye will not aid me then"- P.B.Shelley
           [syn: cowardly, fearful] [ant: brave, courageous]