faithless: applies to any failure to keep a promise or pledge or to any breach or betrayal of obligation, allegiance, or loyalty: ~ allies refused to support the sanctions. (pledge保证誓言: a serious promise严肃的诺言a pledge of support许诺支援) (breach违背诺言: breach of contract违反合同)
false: stresses the fact of failing to be true in any manner or degree ranging from fickleness to cold treachery: betrayed by ~ friends. (fickle多变善变: the group has been notoriously fickle in the past这伙人过去出了名的善变) (treachery随时背叛: 随时准备背叛，本组倒数第二个)
disloyal: implies a lack of complete faithfulness in thoughts or words or actions to a friend, cause, leader, or country: accused the hostage of being ~.
traitorous: implies either actual treason or a serious betrayal of trust: ~ acts punishable by death.
treacherous: implies readiness to betray trust or confidence: the victim of ~ allies.
perfidious: adds to treacherous the implication of an incapacity for fidelity or reliability and of baseness or vileness: repeated and ~ violations of the treaty公约. (base和vile分别表示一般下劣和极端下劣,和low(介于之间)组成一组同义词，应该不难记)
faithless不忠诚: 泛指任何违背诺言(promise,pledge)或违反忠诚效忠义务(obligation,allegiance,loyalty)，false虚假: 泛指不真实, 从多变到随时背叛(fickle,treachery)，disloyal不忠诚: 不是完全忠诚,可轻可重,相对有一点委婉，traitorous叛徒的叛国的: 或叛国或严重背叛，treacherous随时背叛: 表示随时准备背叛信任或信心，perfidious无法忠诚: 上词基础上增加了无法忠诚的意思，可见程度最严重。
记忆方法: 1）首字母FFDTTP重组成Ta Fan Fu De Pian Ta他反复地骗他<==不忠诚
2）练习一下
3）不忠的意思是不忠诚未效忠 mean untrue to someone or something that has a right to expect fidelity or allegiance.首字母FFDTTP重组成Ta Fan Fu De Pian Ta他反复地骗他<==不忠诚
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