Wanting courage; basely or weakly timid or fearful; pusillanimous; spiritless.

lacking courage; ignobly timid and faint-hearted; "cowardly dogs, ye will not aid me then"- P.B.Shelley

Proceeding from fear of danger or other consequences; befitting a coward; dastardly; base; as, cowardly malignity.

In the manner of a coward.