unsuitable

unsuitable — adjective

1. not good enough or correct in terms of who or what it is meant for — for example

1.adjectiveB1
Definition

not good enough or correct in terms of who or what it is meant for — for example, a film that parents consider unsuitable for young viewers, or shoes that are unsuitable for long mountain hikes.

Example

The film was considered unsuitable for young children because of its violent scenes.

collocation: unsuitable for + [age group/people]

Aiko's thin cotton dress was unsuitable for the freezing weather in the mountains.

Common collocations
  • unsuitable for children
  • unsuitable for work
  • unsuitable for purpose
  • unsuitable for the role
  • deem something unsuitable
  • consider someone unsuitable
  • find something unsuitable
  • highly unsuitable
  • totally unsuitable
  • completely unsuitable
Synonyms
  • inappropriate

    stronger focus on social rules or decorum; unsuitable is more practical

  • unfit

    often about health, ability, or condition for a specific role

  • ill-suited

    slightly less common; suggests a poor match in character or design

Antonyms
  • suitable

    the direct opposite; means acceptable or proper for the purpose

  • appropriate

    correct or right for the situation, often with social nuance

  • fitting

    right for the occasion or purpose, with a sense of natural match

Grammar Patterns

unsuitable for something / someone

find / consider / deem someone or something unsuitable

Usage Note

Predominantly used with the preposition 'for' (unsuitable for + noun/gerund). Unlike 'inappropriate', which often carries a social or moral judgement, 'unsuitable' focuses on a practical lack of fit — a tool, a person, or a setting simply does not work well together.

Common Mistakes

These heavy boots are unsuitable to hiking.
These heavy boots are unsuitable for hiking.
The correct preposition after unsuitable is 'for', not 'to'.
This movie is unsuitable with children.
This movie is unsuitable for children.
Use 'for', not 'with', to introduce the person or group affected.

Word family

Synonym discussion

Sense: adjective/1

These four words all describe something that does not match a situation, but they differ in emphasis. Unsuitable is the broadest term; it simply states that something is not good enough or correct for a person or purpose, without judging the reason. Inappropriate adds a layer of social or moral judgment — wearing jeans to a formal wedding is inappropriate, not merely unsuitable. Unfit often implies a lack of the necessary ability, health, or condition: a person may be unfit for military service because of poor eyesight. Ill-suited suggests a poor match in character or design — a quiet librarian may feel ill-suited to a loud sales floor. Improper carries the strongest sense of violating rules or accepted standards, such as improper behaviour in a courtroom. In everyday use, unsuitable is the safest choice when you mean 'not a good fit' without extra judgment.

inappropriate ↗unfit ↗ill-suitedimproper

Common collocations

Nouns

Adverbs

  • highly unsuitable
  • totally unsuitable
  • completely unsuitable
  • entirely unsuitable
  • quite unsuitable
  • clearly unsuitable

Phrases

  • deem unsuitable
  • consider unsuitable
  • find unsuitable
  • prove unsuitable
  • rule someone/something unsuitable

Prepositions

  • unsuitable for
  • unsuitable as

Etymology

Old EnglishAnglo-FrenchEnglish

Formed in English by adding the negative prefix un- (from Old English) to suitable, which itself comes from suit (from Anglo-French suit 'to follow, conform') plus the suffix -able ('capable of being'). The word has been in use since the late 1500s to describe people or things that do not fit a particular purpose.