valid

/ˈvælɪd/ (bre, ipa) · /ˈvælɪd/ (ame, ipa) · /ˈva-ləd/ (ame, mw)

valid — 形容詞

  • validpositive
  • more validcomparative
  • most validsuperlative

1. Something that is valid is based on facts, good reasons, or clear logic, so it c

1.形容詞B1
釋義

合理；有據

基於事實或邏輯而可被接受

Something that is valid is based on facts, good reasons, or clear logic, so it can be seriously considered or trusted.

例句

Xiu made several valid points during the team meeting about the new project.

Xiu 在團隊會議中針對新專案提出了幾個合理的觀點。

valid + point (common noun collocation)

The teacher explained why his argument was not valid in the science report.

老師解釋了為什麼他的論點在科學報告中不成立。

not valid (negation pattern)

同義詞
  • sound

    stronger than valid — implies the argument has both correct logic and true facts

  • reasonable

    focuses on fairness and common sense rather than formal logic

  • legitimate

    suggests acceptance within a social, legal, or moral system

反義詞
  • invalid

    the direct opposite; not based on truth or reason

  • unreasonable

    not based on good sense or fair thinking

文法句型

valid + noun

not + valid

用法筆記

Commonly used with abstract nouns like point, argument, reason, excuse, concern, or question. Very frequent in negative structures — 'not valid' — when rejecting a claim or explanation.

常見錯誤

❌I am valid to join the club.
✅I have a valid reason to join the club.
💡'Valid' describes the reason or argument, not the person. Do not use 'valid' directly after a person's name with 'be.'
❌This is a valid question for asking.
✅This is a valid question.
💡'Valid' already includes the idea of being acceptable; adding 'for asking' is redundant.

2. When a ticket, document, or official paper follows the rules of a system — usual

2.形容詞A2
釋義

有效

在規定時間內可被官方接受使用

When a ticket, document, or official paper follows the rules of a system — usually within a set time limit — it is considered valid.

例句

Sirin's passport is still valid for another six months of international travel.

Sirin 的護照還有六個月的效期，可以出國旅行。

still valid + for + duration

You cannot board the train with a ticket that is no longer valid.

你不能用一張已經過期的車票上火車。

no longer valid (expiry pattern)

同義詞
  • current

    more common for licences and memberships; suggests it has not expired

  • unexpired

    formal term focused on time; still within the allowed period

反義詞
  • expired

    no longer valid because the time limit has passed

  • invalid

    not accepted by the system, often due to expiry or incorrect information

文法句型

valid + for [time period]

valid + until [date]

still valid

no longer valid

用法筆記

Subject is typically a ticket, passport, visa, ID card, coupon, subscription, membership, or licence. Frequently followed by 'for' (duration), 'until' (expiry date), or 'in' (location).

常見錯誤

❌My passport is validate until next year.
✅My passport is valid until next year.
💡'Valid' is an adjective; 'validate' is a verb meaning to make something officially acceptable.
❌The ticket is valid for use in three months.
✅The ticket is valid for three months.
💡'For' already shows the time period; adding 'use in' is unnecessary.

3. A legal document, agreement, or action is valid when the law recognizes it as ha

3.形容詞B2
釋義

具法律效力

經法律承認而具有約束力

A legal document, agreement, or action is valid when the law recognizes it as having full authority and binding power.

例句

The contract is valid only if both parties sign it in front of a witness.

這份合約只有雙方在有見證人的情況下簽署才具有法律效力。

valid + condition (only if)

Mauricio's will was declared valid by the judge after the court hearing.

法官在聽證會後宣布 Mauricio 的遺囑有效。

passive: declared valid + by [authority]

同義詞
  • lawful

    broader term meaning allowed by law; not limited to documents and agreements

  • binding

    emphasises that a contract or promise must be followed

  • enforceable

    can be made effective by a court if one party does not obey

反義詞
  • void

    having no legal force from the beginning, as if it never existed

  • null and void

    legal phrase meaning completely without legal effect

文法句型

legally valid

declared valid

valid under [law]

valid + only if [condition]

用法筆記

Subject is typically contract, will, marriage, agreement, signature, or legislation. Frequently passive — 'declared valid,' 'ruled valid,' 'held to be valid.' Common in formal legal writing and court contexts.

常見錯誤

❌The agreement is valid in law.
✅The agreement is valid under the law.
💡'Under the law' or 'under [system] law' is the standard legal preposition; 'in law' is less idiomatic in this context.
❌This signature is validate by the lawyer.
✅This signature is validated by the lawyer.
💡Use the verb 'validate' (with '-ed') for the action of making something valid; 'valid' is an adjective describing the state.