bad form

bad form — idiom

1. ways of behaving that people in a particular social group consider rude or unacc

1.idiomB2
Definition

ways of behaving that people in a particular social group consider rude or unacceptable according to unwritten rules of etiquette

Example

Adina's grandmother thought it was bad form to speak with your mouth full.

it + be + bad form + to-infinitive pattern

At the charity dinner, arriving late was considered terribly bad form by the hosts.

passive: considered [adv] + bad form

Common collocations
  • considered bad form
  • regarded as bad form
  • terribly bad form
  • very bad form
  • be bad form to
Synonyms
  • bad manners

    more universal and focuses on rudeness toward individuals rather than breach of etiquette codes

  • poor form

    near synonym, slightly less common; also used in sports for unsportsmanlike conduct

  • improper behaviour

    more formal and serious; suggests a breach of professional or moral standards

Antonyms
  • good form

    direct opposite; behaviour that follows social etiquette

  • good manners

    polite, considerate behaviour toward others

Grammar Patterns

it + be + bad form + to-infinitive

Usage Note

The idiom typically appears in the pattern 'it + be + bad form + to-infinitive' rather than as a direct object noun phrase. Constructions like 'He showed bad form' sound unnatural. The expression is distinctly British and most common in traditional or polite social contexts.

Common Mistakes

She committed bad form at the party.
It was bad form to leave the party early without saying goodbye.
The idiom does not take verbs like 'commit' or 'do'; it follows 'it + be + bad form + to-infinitive'.

Synonym discussion

Sense: idiom/1

Bad form, bad manners, poor form, and improper behaviour all describe socially unacceptable conduct, but they differ in tone and context. Bad form is distinctly British and carries a sense of breaching unwritten etiquette rules, often in formal or traditional settings. Bad manners is more universal and focuses on rudeness toward individuals — any culture would understand 'talking with your mouth full is bad manners.' Poor form is a near synonym of bad form but is slightly less common and can extend to sport (criticising 'poor form' from a player who acts unsportsmanlike). Improper behaviour is the most formal and serious, suggesting a breach of professional, legal, or moral standards. For example: 'It was bad form to arrive empty-handed' (etiquette breach) versus 'His improper behaviour led to a formal complaint' (professional misconduct).

bad mannerspoor formimproper behaviour

Etymology

English

The phrase 'bad form' emerged in 19th-century British public school and upper-class society, where 'form' referred to the established code of conduct or socially acceptable behaviour. Describing something as 'bad form' meant it violated these unwritten social rules. The expression gained wide circulation through Victorian-era etiquette manuals, novels, and magazine articles, and remains in use today, especially in British English.