definite

Compared meaning: sure, clearly decided (adjective).

比较义项：确定的、肯定的（形容词）。

• certain

  Describes a person's inner conviction or confidence about a fact, typically used predicatively with 'that' clauses or 'about'; focuses on the speaker's certainty, not the thing itself.

  描述说话人对某事实的内心确信,常以谓语形式接that从句或about,强调说话人本身的确信程度,而非事物本身。

  She was certain that she had left her keys on the table.

  她确信自己把钥匙放在了桌子上。

• definite 本词

  Describes something (an answer, plan, date) as clear, fixed, and unlikely to change; focuses on the thing itself being settled, often used attributively before a noun.

  描述某事物(答案、计划、日期)本身清晰、固定、不太可能改变,强调事物本身已经确定,常作定语放在名词前。

  They still haven't given us a definite date for the wedding.

  他们还没有给我们一个确定的婚礼日期。

Certain and definite both mean sure or decided, but certain focuses on a person's inner confidence, while definite focuses on the thing itself being fixed, like a plan or date. Certain can also mean 'a particular one'; not compared here.

这两个词都表示“确定、肯定”，但certain更强调说话人自己内心确信的状态，常接that从句；definite更强调事物本身清晰、明确、不会再变。certain还有“某一个（不具体说明）”的另一义项，这里不作比较。

Compared meaning: sure, without doubt (adjective).

比较义项：确定无疑、无可怀疑的（形容词）。

• certain

  Certain describes the speaker's own confidence or conviction about something; it focuses on the speaker's state of mind, not on proof, and is usually followed by "that" or "of".

  certain 强调说话人自己的确信程度，常与 that 或 of 连用，说的是说话人的心理状态，而不是事实是否已被证实。

  He seemed certain that the train left at nine, but he was wrong.

  他似乎很确信火车九点发车，但他错了。

• definite 本词

  Definite describes something fixed, settled or clearly decided, such as a plan, date or answer; it modifies the thing itself before a noun, not a person's belief.

  definite 强调某件事本身是固定、已确定或说得很清楚的，常用于计划、日期或答案，放在名词前面，说的不是某人的信念。

  Can you give me a definite date for the meeting, not just a rough idea?

  你能给我一个确定的会议日期吗，而不只是一个大概的想法？

• indisputable

  Indisputable describes evidence or facts so strongly proven that no reasonable person could argue against them; it is stronger and more formal than certain or definite, and is not used for personal feelings.

  indisputable 强调证据或事实极具说服力，任何理性的人都无法反驳，语气比 certain 和 definite 更强、更正式，不用来描述个人的感受。

  The DNA evidence was indisputable, so the suspect had no way to deny it.

  DNA证据是无可争辩的，所以嫌疑人根本无法否认。

Certain, definite, and indisputable all mean sure, without doubt. Certain describes a speaker's own confidence, focusing on their state of mind. Definite describes something fixed or clearly decided, like a plan. Indisputable describes evidence proven beyond any reasonable argument, the strongest and most formal word.

这三个词都表示“确定”，但侧重点不同：certain 强调说话人自己心里有把握，definite 强调事物本身已经固定、说清楚了，indisputable 强调证据确凿到没人能反驳，语气由弱到强、由主观到客观。这里不比较 certain 作限定词表示“某个（不便说明的）”的用法，例如 a certain person。