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be a cad
cad 是名词，专指道德卑劣的男人，其复数为 cads。
He is a cad and nobody trusts him.
他是个无赖，没人信任他。
卑鄙的男人；下流人；无赖
cads — plural of cad
先理解核心含义，再看它在真实句子里的用法。
卑鄙的男人；下流人；无赖
a man who is morally reprehensible
He is a cad and nobody trusts him.
他是个无赖，没人信任他。
低贱、放肆的人,卑鄙粗俗的家伙,尤其指不可托付女士者
A low-bred, presuming person; a mean, vulgar fellow, especially one that cannot be trusted with a lady.
石蛾幼虫
A caddis (caddisfly larva).
After he borrowed money and never paid it back, everyone called him a cad.
他借了钱从不归还，大家都叫他无赖。
She refused to dance with a cad who had insulted her friend.
她拒绝和一个侮辱了她朋友的无赖跳舞。
Those cads laughed at the old man and walked away.
那些无赖嘲笑老人后走开了。
cad 是名词，专指道德卑劣的男人，其复数为 cads。
He is a cad and nobody trusts him.
他是个无赖，没人信任他。
A cad who lies to his friends will soon be alone.
对朋友撒谎的无赖很快就会没人理睬。
注意：大写的 CAD 常指“计算机辅助设计”，和小写的 cad（无赖）拼写相同但意思不同。
He behaved like a cad when he ignored her calls.
他不接她的电话，表现得像个无赖。
Not this
He is cad.
Use this
He is a cad.
cad 是可数名词，单数形式前必须加限定词；He is cad 缺少冠词 a，应改为 He is a cad。
Not this
He is very cad.
Use this
He is very much a cad.
cad 是名词，不是形容词，不能直接受 very 修饰；要表达“非常无赖/十足的无赖”可用 very much a cad，或改用其他结构。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
无赖与恶棍
He was described in the papers as a cad and a bounder.
他在报纸上被描述为一个无赖和恶棍。
厚颜无耻的无赖
Only a shameless cad would speak to her like that.
只有厚颜无耻的无赖才会那样跟她说话。
行为像无赖；行为卑鄙
He behaved like a cad, leaving without paying.
他行为像无赖，没付钱就走了。
十足的无赖
She soon realized he was a thorough cad.
她很快意识到他是个十足的无赖。
Use cads naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
cad 与 bad 同韵，但以 c 开头：记住他是个比 bad 更坏的下流男人。
语域：informal 常见场景：旧式口语、文学或影视作品中的角色描写 这个词是较老派的非正式用语，多用于指对女性不诚实或品行不端的男人，现在日常口语中较少见，带有一点旧时代或戏谑的语气。
这些词都与 cad 押韵，读音为 /æd/：bad, had, mad, sad, lad, pad。注意：cad 不要与 code /koʊd/、cud /kʌd/、wad /wɒd/ 混淆，它们拼写相似但读音不同。
Dictionary facts from ECDICT, WIKTIONARY.