dishonest: implies a willful perversion of truth in order to deceive, cheat, defraud: a swindle usually involves ~ people. （perverse歪曲扭曲语气很重，表示错误无理怪异wrong-headed, unreasonable, and cranky如the perversion of justice歪曲正义，sexual perversion性变态，因此dishonest的语气在这一组属于最重的，和lying接近） deceive欺骗的目的是让人"把假的东西当真"，cheat欺骗作弊的目的是让人"不知道"， defraud欺诈的目的是让人"财产或利益受损失" swindle诈骗，规模较大，小规模是scam,如telecom scam电信诈骗
deceitful: usually implies an intent to mislead and commonly suggests a false appearance or duplicitous behavior: leant of the secret of his ~ partner. duplicitous伪装的两面派的，词根dup表示two。
mendacious: less forthright than lying, may suggest bland or even harmless mischievous deceit and often suggests a habit of telling untruths: his sea story became increasingly ~. forthright直截了当 (bland平淡not intense, strong，如bland personality平淡沉闷的个性，bland food平淡低油低盐的食物，这里表示不重要没什么大不了)
lying: implies a specific act or instance rather than a habit or tendency and suggests guilt: a conviction based upon testimony of a ~ witness.
untruthful: is a less harsh term than lying and stresses a discrepancy between what is said or represented and the facts or reality of the situation rather than an intent to deceive: the version given in her memoirs is ~ in several respects.
dishonest欺诈的(重): 指任意曲解事实，目的是欺诈舞弊，deceitful欺骗的: 使用虚假的言行去误导他人，mendacious扯谎(贬义轻): 表示说些没什么大不了的甚至无害的谎话，lying欺骗的: 指特定事实，问题严重(guilt罪，至少是严重错误)，untruthful不真实: 强调言语和事实不符，而非故意欺骗，不像lying那么重。
记忆方法: 1）首字母DDMLU想成LoaD MUD装稀泥<==欺骗误导
2）欺骗的意思是不值得信任mean unworthy of trust or belief.
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