Webster's English Dictionary

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faithless

faith.less \'fa-th-l*s\ aj 1: marked by absence of faith  2: not worthy of 
   trust or reliance : DISLOYAL MPERFIDIOUS: FAITHLESS applies to any failure 
   to keep a promise or pledge or any breach of allegiance or loyalty; FALSE 
   stresses the fact of failing to be true in any manner ranging from 
   fickleness to cold treachery; DISLOYAL implies a lack of complete 
   faithfulness in thought or words or actions to a friend, cause, leader, or 
   country; TRAITOROUS implies either actual treason or a serious betrayal of 
   trust; TREACHEROUS implies readiness to betray trust or confidence more 
   commonly through lack of scruple than through weakness; PERFIDIOUS adds to 
   FAITHLESS the implication of an incapacity for fidelity or reliability - 
   faith.less.ly av SYN syn FALSE, DISLOYAL, TRAITOROUS, TREACHEROUS,