unlawful: implies lack of conformity with law of any sort: ~ conduct.     （conform有2个意思  1、使一致相似to be similar or the same，如her behavior conforms to/with a pattern她的行为与一种模式一致，如the results conforms to/with the estimates结果与预估一致，如her ideas do not conform to/with mine她的观点与我的不一致  2、遵守服从to obey，如we should conform to/with the rules/regulations遵守规则/规定。两个意思接近不用区分，介词to/with都可以互换。conformist有贬义，表示随大流、循规蹈矩，不愿意尝试不同不寻常事物的人，如a conformist attitude/society随大流的态度/循规蹈矩的社会）


illegal: often stresses lack of conformity to what is sanctioned by the law as defined by statute and administered by courts: an ~ U-turn.    statute成文法律、法令法规implies a law enacted by a legislative body指立法机构订立的法律，如a statute requiring the use of seat belts立法要求使用安全带，如the statute of a university大学校规   sanction正式批准同意    enact制定法律，或通过议案    administer执行法律行政，如the Trump administration川普政府  


illegitimate: tends to be narrow in reference and usually applies to children born out of wedlock or to a relation leading to such a result: their union was ~; but it may refer to something that is not proper according to rules of logic or to authorities or to precedent: an ~ inference.     如illegitimate use of company property不正当使用公司财产，如本例不正当或非法干涉，如an illegitimate seizure of power非法夺权，如the election was dismissed as illegitimate by the opposition反对党以不合法为由拒绝接受选举结果


illicit: may imply lack of conformance with a regulatory law: ~ distilling; but it is also applied to something obtained, done, or maintained unlawfully, illegally, or illegitimately: an ~ affair.      法规regulation中的regulate表示管控调控to set or control the amount, degree, or rate of something，如laws that regulate the content of the Internet法律调控/管控因特网内容，如to regulate gun sales调控/管控枪支售卖      又如illicit drugs/love affair违禁药物/不正当的风流韵事


unlawful非法: 泛指未遵守任何种类的法律，illegal非法: 指未遵守立法机构订立、法院执行的法律，通常更严重，illegitimate私生、不当: 特指私生子的，或不符合逻辑权威先例，illicit非法不当: 指未遵守法规，或泛指非法不正当  


记忆方法: 1）首字母UIII想成你1我3<==非法

         2）非法的意思是与法不符mean not being in accordance with law.