unprofessional

unprofessional — adjective

1. describing behaviour, work, or appearance that does not reach the level of quali

1.adjectiveC1
Definition

describing behaviour, work, or appearance that does not reach the level of quality, skill, or good manners that people expect from someone with a particular job or role

Example

Sana was asked to leave the clinic after her unprofessional comments upset several patients.

passive: was asked to leave after [reason]

Chewing gum during a job interview is widely seen as unprofessional behaviour.

gerund subject: chewing gum... is seen as [adjective]

Common collocations
  • unprofessional behaviour
  • unprofessional conduct
  • unprofessional attitude
  • unprofessional manner
  • unprofessional appearance
  • deeply unprofessional
  • completely unprofessional
  • thoroughly unprofessional
Synonyms
  • unbecoming

    more formal, and often used specifically for conduct that brings shame to a role or position

  • improper

    broader in scope, covering social or ethical lapses beyond work contexts

  • unacceptable

    stronger in tone, implying the behaviour simply cannot be tolerated

Antonyms
  • professional

    the direct and most common opposite

  • proper

    less specific and usable in a wider range of contexts

Grammar Patterns

unprofessional + noun

be/seem/look + unprofessional

find + noun + unprofessional

Usage Note

Frequent in workplace and formal contexts. The adjective carries a clear negative judgement and is commonly used in predicate position after verbs like be, seem, or look, as well as attributively before nouns such as behaviour, conduct, attitude, or appearance.

Common Mistakes

The chef was unprofessional because he had not been to cooking school.
The chef was untrained because he had not been to cooking school.
unprofessional describes a failure to meet expected conduct or quality standards, not a lack of formal education or training.

Word family

Synonym discussion

Sense: adjective/1

All four words describe conduct that falls short of expectations, but they differ in scope and setting. Unprofessional is tied specifically to workplace or role-based standards — a doctor who breaks patient confidentiality is unprofessional. Unbecoming is more formal and suggests conduct that brings shame to one's position or character, appearing often in official reprimands. Improper covers anything socially, ethically, or procedurally wrong and is much broader. Unacceptable is the strongest: it implies the behaviour crosses a line and cannot be tolerated, without necessarily linking it to a profession. For example, arriving late to a meeting might be called unprofessional or improper, but only a serious breach such as shouting at a client would be called unacceptable.

unprofessional ↗unbecomingimproperunacceptable ↗

Common collocations

Nouns

Adverbs

Phrases

  • it is unprofessional to [verb]
  • find something unprofessional

Etymology

LatinFrenchEnglish

Formed from the prefix un- (meaning 'not') added to professional. Professional traces back through late Latin professio ('public declaration of a calling') and Latin profitērī ('to declare publicly'). The sense of 'professional' as relating to a skilled paid occupation became common in the 18th century, and the negative form unprofessional came into regular use in the 1800s.