punk

Compared meaning: a rough or violent person (noun).

比较义项：粗暴或恶劣的人（名词）。

• tough

  Describes a rough, physically intimidating person, often just tough-looking rather than a proven criminal; frequently used in the plural 'toughs' in casual or news writing.

  指外表粗野、有威慑力的人，未必真的犯过罪，语气不如thug强烈；常用复数形式“toughs”，多见于口语或新闻报道。

  A few neighborhood toughs hung around the corner store all evening.

  几个彪形大汉整晚都在街角小店附近闲晃。

• thug

  The strongest and most negative term, naming a violent criminal who uses force or threats, typically in muggings, gang violence or organized crime.

  语气最强烈、最负面，指使用暴力或威胁手段的犯罪分子，常见于抢劫、帮派暴力或有组织犯罪的语境。

  The thug pulled a knife and demanded the tourist's wallet.

  那个暴徒掏出刀子，逼游客交出钱包。

• punk 本词

  Informal, especially American English, for a worthless, cocky young troublemaker; used almost like an insult and does not necessarily imply serious violence.

  非正式用语，尤见于美式英语，指自以为是、爱惹麻烦的废物青年，几乎带有侮辱意味，未必真的涉及严重暴力。

  Stop causing trouble, punk, or I'll call your parents.

  别惹麻烦了，臭小子，不然我就叫你父母来。

Tough, thug and punk all describe a rough or bad person. Tough describes someone physically intimidating-looking, not necessarily a criminal. Thug is the strongest word, naming a violent criminal who uses force. Punk is informal, American English, for a cocky, worthless young troublemaker.

这三个词在表示“粗暴或恶劣的人”时意思相近，但语气强弱和使用场合不同：tough多指外表凶悍的壮汉，thug语气最重、多指使用暴力的罪犯，punk则是非正式的贬称，多指爱惹麻烦的年轻人。这里不比较tough作形容词表示“困难的”、以及punk指“朋克音乐或风格”的用法。

Compared meaning: of poor quality (adjective).

比较义项：质量差、劣质的（形容词）。

• punk 本词

  Very informal, dated American slang; usually describes something considered worthless or shoddy, often in fixed phrases like 'punk excuse'; rarely used by younger speakers today.

  非常口语化，带有过时的美式俚语色彩；通常用来形容被认为毫无价值或劣质的东西，常见于“punk excuse”这类固定搭配；如今年轻人很少使用。

  His punk excuse for missing the meeting fooled no one.

  他为缺席会议找的借口很蹩脚，没有骗到任何人。

• cheap

  The most common, neutral word for poor quality, often implying it is that way because it was made cheaply or priced low; can describe objects, materials, or workmanship.

  表示劣质最常见、最中性的词，通常暗示这是因为制作粗糙或定价低廉造成的；可以形容物品、材料或做工。

  The umbrella broke instantly because it was made from cheap plastic.

  这把雨伞因为是劣质塑料做的，一下子就坏了。

• bum

  Informal American English; typically describes something defective, faulty or not working properly, often a body part, deal, or piece of equipment, as in 'bum knee' or 'bum deal'.

  美式英语口语化用词，通常形容有缺陷、出故障或不好用的东西，常用于身体部位、交易或设备（如“bum knee”膝盖不好、“bum deal”糟糕的交易）。

  The mechanic said the car had a bum transmission that kept stalling.

  修车师傅说这辆车的变速箱质量低劣，总是熄火。

• inferior

  Formal and neutral in tone; explicitly compares quality to something else, often followed by 'to', and is common in reviews, consumer reports, and technical writing.

  语气正式、中性，明确将某物的质量与另一物比较，常与“to”连用，多见于评测、消费者报告和技术写作中。

  Critics judged the sequel's special effects clearly inferior to the original film's.

  影评人认为续集的特效明显不如原版电影。

Punk, cheap, bum, and inferior all mean poor quality. Punk is informal, old-fashioned slang. Cheap is the most common, neutral word. Bum is informal American English, like 'a bum knee'. Inferior is formal, often used with 'to'. Each also has other meanings not compared here.

这四个词都可以表示“质量差、劣质的”，但语域和用法不同：cheap 最常用、语气中性；bum 和 punk 更口语化，其中 punk 带有过时的俚语色彩；inferior 则正式，常用于比较句式“inferior to”。这里不比较 punk 的“朋克（音乐流派/亚文化）”含义，也不比较 bum 作名词表示“屁股”或“流浪汉”的含义，以及 cheap 表示“价格低廉”的含义。