Synonyms and related words :
discourteous, disrespectful, gritless, gutless, heartless, impolite, inaffable, insolent, pluckless, rude, spiritless, spunkless, unaccommodating, uncivil, uncomplaisant, uncourageous, uncourteous, uncourtly, undaring, ungracious, unheroic, unintrepid, unpolite, unsoldierlike, unsoldierly, unvaliant, unvalorous