invalidity

/ˌɪnvəˈlɪdəti/ (bre, ipa) · /ˌɪnvəˈlɪdəti/ (ame, ipa) · /ˌin-və-ˈli-də-tē -va-/ (ame, mw)

invalidity — noun

1. a state in which a document, decision, or other official act has no legal or for

1.名詞C1
釋義

a state in which a document, decision, or other official act has no legal or formal force

例句

The court ruled on the invalidity of the contract after the missing signature was found.

rule on the invalidity of + contract

Lawyers argued over the invalidity of the permit issued without the town seal.

invalidity of + permit in official context

同義詞
  • nullity

    more technical and often stronger, suggesting no legal force at all

  • unenforceability

    narrower term for agreements a court will not force people to obey

  • illegality

    focuses on breaking the law itself, not just lacking valid force

反義詞
  • validity

    the state of being legally or officially accepted

  • enforceability

    emphasises that a court can make the agreement take effect

文法句型

invalidity of + noun phrase

rule on the invalidity of + noun phrase

用法筆記

Common in legal or official discussion after challenge, rule on, prove, or admit. The noun after 'of' is usually a contract, permit, vote, visa, or similar official act.

常見錯誤

❌The court discussed the invalidity the contract.
✅The court discussed the invalidity of the contract.
💡'invalidity' normally takes 'of' before the document or act it refers to.
❌My train ticket has invalidity.
✅My train ticket is invalid.
💡In everyday situations, English usually uses the adjective 'invalid' instead of the noun 'invalidity'.

2. a state in which illness or injury leaves someone unable to work or look after b

2.名詞C1
釋義

a state in which illness or injury leaves someone unable to work or look after basic daily needs

例句

After the stroke, Christopher faced months of invalidity and needed help dressing.

months of invalidity after illness

The family rented a small apartment during Aoi's long invalidity.

during + invalidity for a period of illness

同義詞
  • incapacity

    formal and broad; can also cover mental or legal inability

  • disability

    broader and more common today, not limited to periods of illness

  • invalidism

    older term that often sounds dated in modern English

反義詞
  • recovery

    focuses on returning to health after illness or injury

  • independence

    emphasises being able to care for yourself without help

文法句型

during + invalidity

months/years of + invalidity

用法筆記

Common in formal writing about illness, disability, insurance, or care. It usually describes a period when paid work and ordinary self-care become impossible.

常見錯誤

❌She stayed home with an invalidity.
✅She stayed home because of invalidity.
💡Use the noun for a state or period, not as a countable thing.
❌He had invalidity for a cold last week.
✅He was off sick with a cold last week.
💡'invalidity' is too formal and serious for a short everyday illness.