adj.未达专业水平的，违反职业道德的

He frequently arrived late for meetings, dressed inappropriately, and often interrupted others – a textbook example of unprofessional behavior.
他经常会议迟到，着装不得体，且时常打断他人发言，这是典型的不专业行为。
Her constant use of slang and casual language in official emails demonstrated a clear lack of professionalism.
她在正式邮件中频繁使用俚语和随意的语言，明显表现出缺乏专业性。
The manager's emotional outburst during the client presentation was highly unprofessional and damaged our company's reputation.
经理在客户演示期间的情绪爆发极其不专业，损害了我们公司的声誉。
Despite repeated reminders, he failed to meet project deadlines, displaying an unprofessional attitude toward his responsibilities.
尽管多次提醒，他仍未能按时完成项目，显示出对职责的不专业态度。
She frequently discussed confidential company information in public areas, which is not only unethical but also extremely unprofessional.
她经常在公共场所讨论公司机密信息，这不仅不道德，而且极其不专业。
His constant gossiping and spreading rumors about colleagues revealed a deep-seated unprofessionalism in his character.
他不断八卦并散布关于同事的谣言，揭示出其性格深处的不专业。
The sales representative made inappropriate jokes during the business dinner, leaving the clients feeling uncomfortable and perceiving him as unprofessional.
销售代表在商务晚宴上讲了不恰当的笑话，让客户感到不适，并认为他很不专业。
The accountant's sloppy record-keeping and frequent calculation errors demonstrated a concerning level of unprofessionalism in her work.
会计师粗心的记账方式和频繁的计算错误，显示了她在工作中令人担忧的不专业程度。
His habit of taking personal calls during working hours and neglecting his duties displayed a blatant disregard for professional boundaries.
他在工作时间接听私人电话并忽视职责的习惯，明显无视了职业界限。
She consistently failed to follow established protocols and procedures, leading to numerous avoidable mistakes and portraying herself as unprofessional.
她一直未能遵循既定的规程和程序，导致了许多本可避免的错误，给人留下了不专业的印象。