Having no spines, prickles, or thorns. / Having no spinal column. / Cowardly, uncourageous; lacking character.

The state or quality of being spineless (not having a spine (literally or figuratively)); cowardice.

(historical, psychiatry) One of the four subtypes of sadistic personality disorder as defined by the American psychiatrist Theodore Millon. Includes features of avoidant personality disorder

In a spineless manner.