1
It is unprofessional (of sb) to do sth
多用于指责某人的行为违背职业规范。
It was unprofessional of him to interrupt the judge.
他打断法官的做法很不专业。
不专业的；违反职业规范的；外行的
先理解核心含义，再看它在真实句子里的用法。
不专业的；违反职业规范的；外行的
not characteristic of or befitting a profession or a professional person
It was unprofessional of him to interrupt the judge.
他打断法官的做法很不专业。
有失职业身份的；不适宜工作场所的。
Unbecoming of a professional; hence inappropriate in the workplace.
没有职业的。
Lacking a profession.
与职业无关的；非专业的。
Not relating to professional occupation or employment; nonprofessional.
It was unprofessional of him to check his phone during the client presentation.
他在向客户作演示时看手机，这很不专业。
Wearing jeans to the job interview gave an unprofessional impression.
穿着牛仔裤去求职面试会给人不专业的印象。
Her unprofessional email upset several colleagues.
她那封不专业的邮件让几位同事感到不快。
多用于指责某人的行为违背职业规范。
It was unprofessional of him to interrupt the judge.
他打断法官的做法很不专业。
主语常为 behavior、conduct、attitude 等表示行为或态度的名词。
Her behavior at the meeting was unprofessional.
她在会议上的举止不专业。
该结构为“动词+宾语+形容词补语”，形容词描述宾语的状态。
The board considered his handling of the case unprofessional.
董事会认为他处理此案的方式有违职业操守。
Not this
He behaved unprofessional at the party.
Use this
He behaved unprofessionally at the party.
behave 是动词，需要用副词修饰；unprofessional 是形容词，应改为 unprofessionally。
Not this
The unprofessional of his behavior was criticized.
Use this
The unprofessionalism of his behavior was criticized.
在“the + ___ + of”结构中需要名词；unprofessional 是形容词，其名词形式是 unprofessionalism。
Not this
She is an unprofessional photographer; she only takes photos for friends.
Use this
She is not a professional photographer; she only takes photos for friends.
unprofessional 指“违反职业标准的、不专业的”；表达“不是职业/专业的”（未从业）时应用 not a professional + 名词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
不专业的行为
His unprofessional behavior at the meeting was widely criticized.
他在会议上的不专业行为受到广泛批评。
不专业的态度
Her unprofessional attitude made the client request a different account manager.
她不专业的态度使客户要求换一位客户经理。
不专业的方式
The manager corrected the staff member in an unprofessional manner.
经理以不专业的方式纠正了员工。
极不专业（的）
Sending the email with typos in it was highly unprofessional.
发送带有拼写错误的电子邮件极不专业。
显得不专业
Showing up late to an interview makes you look unprofessional.
面试迟到会让你显得不专业。
Use unprofessional naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
un-（不）+ professional（专业）→ 做事不专业、不合行规。想象一个医生不戴手套做手术，就是 unprofessional。
语域：neutral 常见场景：performance reviews、client feedback、workplace conduct 该词通常用于描述违背职业规范或行业标准的行为，带有批评和负面评价的意味。它属于中性偏正式的词，在职场反馈、客户投诉和行业讨论等场景中比较常见，正式与非正式场合均可使用。
真正押韵的词：professional /prəˈfeʃənəl/、confessional /kənˈfeʃənəl/、congressional /kənˈɡreʃənəl/，它们都以 /-eʃənəl/ 构成韵脚，与 unprofessional 押韵。注意拼写相近但发音不同的词：provisional /prəˈvɪʒənəl/、provincial /prəˈvɪnʃəl/、unprofitable /ʌnˈprɒfɪtəbəl/。
Dictionary facts from ECDICT, WIKTIONARY.