Behaving in a way that people in your line of work would not accept. It is a judgement against a standard, and the standard belongs to the job, not to the person speaking — so the same act can be unprofessional in one job and fine in another. A doctor discussing a patient's illness at dinner is being unprofessional; a chef describing tonight's fish at dinner is doing their job.

Behaving in a way行為方式 that people in your line of work would not accept同行的人無法接受 is unprofessional就是 unprofessional。It is a judgement against a standard這是拿一個標準來評斷, and the standard belongs to the job而這個標準屬於這份工作, not to the person speaking不是屬於講話的人 — so the same act所以同樣一個行為 can be unprofessional in one job and fine in another在一個行業裡算 unprofessional，換個行業卻沒問題。A doctor discussing a patient's illness at dinner醫生在飯桌上談論病人的病情 is being unprofessional就是 unprofessional; a chef describing tonight's fish at dinner廚師在飯桌上介紹今晚的魚 is doing their job卻只是在做他的工作。

Two kinds of thing get called unprofessional. The heavy kind is a real breach of a job's rules — a lawyer using a client's money, a nurse turning up drunk — and this can end a career, since professional bodies use the word in formal charges. The light kind is much more common and much vaguer: arriving late, swearing in front of customers, a messy email, arguing with a colleague where clients can hear.

Two kinds of thing get called unprofessional有兩種情況會被說是 unprofessional。The heavy kind is a real breach of a job's rules嚴重的那種是真的違反這份工作的規範 — a lawyer using a client's money律師挪用客戶的錢, a nurse turning up drunk護理師喝醉了來上班 — and this can end a career這種可能會斷送一個人的職業生涯, since professional bodies use the word in formal charges因為專業機構會在正式指控裡用這個字。The light kind is much more common and much vaguer輕微的那種常見多了，也模糊多了: arriving late像遲到, swearing in front of customers在客人面前罵髒話, a messy email一封亂七八糟的信, arguing with a colleague where clients can hear在客戶聽得到的地方跟同事吵架，都算。

Here the word often means little more than "I disapprove", and it is worth being honest with students about that, because it can be used to police clothes, accents and manners as much as actual conduct.

Here the word often means little more than這裡這個字通常不過就是 "I disapprove"「我不認同」的意思, and it is worth being honest with students about that值得跟學生老實說清楚這一點, because it can be used to police因為它可以被拿來管束 clothes, accents and manners穿著、口音和舉止 as much as actual conduct跟真正的行為一樣多。

It also describes work of poor quality — an unprofessional-looking website, an unprofessional repair job — meaning it looks like an amateur did it.

It also describes work of poor quality它也可以形容品質差的工作 — an unprofessional-looking website像看起來很不專業的網站, an unprofessional repair job不專業的維修工作 — meaning it looks like an amateur did it意思是看起來像業餘人士做的。

The rare noun means a person without the proper qualifications for a profession; you will almost never meet it.

The rare noun少見的名詞用法 means a person指的是一個人 without the proper qualifications for a profession沒有從事某個專業該有的資格; you will almost never meet it你幾乎不會遇到這個用法。