To justify means to show or prove something to be right, reasonable, or necessary; to give a good reason for an action, decision, or belief.
What Does Justify Mean?
Justify comes from the Latin justificare, meaning "to make righteous" or "to show as correct", from justus (just, fair) and facere (to make). It entered English via Old French in the 14th century. The core meaning has remained stable: when you justify something, you are not simply describing it — you are arguing that it was the correct or acceptable choice.
The word appears in three main contexts in modern English. In everyday speech it means "to give a reason": "Can you justify your decision?" In academic and professional writing it means "to provide evidence for a position": "This data justifies our conclusion." In printing and typography it has a technical meaning: text that is aligned along both margins is described as justified.
A common ESL error is using justify where explain is the better choice. Explain is neutral — you describe why something happened. Justify is argumentative — you claim something was right. Another frequent mistake is "justify to do" instead of "justify doing": say "She justified taking the risk", not "She justified to take the risk." See Cambridge Dictionary's full entry on “justify” for more examples.
Example Sentences
| Sentence | Usage note |
|---|---|
| The manager struggled to justify the budget cuts to her team. | justify + noun phrase (professional) |
| Nothing can justify treating people with disrespect. | justify + gerund (ethical/moral) |
| The essay should justify your argument with evidence from the text. | academic writing instruction |
| He justified his late arrival by explaining there had been a train delay. | justify + noun + by + gerund |
| Can you really justify spending that much on a gym membership? | informal / questioning a decision |
| The success of the project justified all the long hours the team had put in. | outcome justifies effort |
| The court found that the use of force was not justified in this case. | legal register, passive voice |
| Politicians are often asked to justify their policies to voters. | political / public accountability |
Word Forms
| Form | Word | Example |
|---|---|---|
| Verb (base) | justify | You need to justify your answer. |
| Verb (past) | justified | She justified her decision with clear reasons. |
| Verb (gerund) | justifying | Justifying every choice takes time. |
| Noun | justification | There is no justification for that behaviour. |
| Adjective | justified | His anger was completely justified. |
| Adjective (negative) | unjustified | The criticism was unjustified and hurtful. |
| Adverb | justifiably | She was justifiably proud of her results. |
Common Collocations
| Collocation | Example phrase |
|---|---|
| justify a decision | "The board had to justify its decision to shareholders." |
| justify the cost | "The improved performance justifies the extra cost." |
| justify the means | "Does the end really justify the means?" |
| fully justified | "Her concerns were fully justified by later events." |
| justify one's actions | "He was unable to justify his actions in court." |
| hardly justify | "One bad review can hardly justify changing the whole product." |
| justify an argument | "You must justify your argument with reliable sources." |
| morally justify | "It is difficult to morally justify the use of child labour." |
Synonyms
Antonyms
Common Mistakes
Watch Out For
She justified to take the extra money.
She justified taking the extra money. (Use a gerund after justify, not an infinitive.)
He justified himself the mistake.
He justified the mistake. (Do not add a reflexive pronoun unless the meaning is self-vindication: "He justified himself to the committee.")
I need to justify why I was late. (overly casual in formal writing)
I need to provide justification for my late arrival. (formal/written register)
Related Words
Practise This Word
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Frequently Asked Questions about “justify”
What does justify mean?
Justify means to give a good reason for something, or to show that an action or decision is right and reasonable. For example: 'He could not justify spending so much money on a new phone.' It is frequently used in academic writing, law, and everyday arguments.
Is justify a verb?
Yes, justify is a verb. It follows regular conjugation: justify, justified, justified. The related noun is justification (the reason given), and the adjective is justified (shown to be correct) or unjustified (not shown to be correct). The adverb is justifiably.
What is the difference between justify and explain?
Explain simply describes why something happened or how something works, without implying it was correct. Justify goes further — it argues that something was right or acceptable. You can explain a mistake without justifying it. In academic writing, you are often asked to justify your argument, not just explain it.
How do you use justify in a sentence?
Use justify followed by a noun or a gerund (-ing form): 'She justified her decision by listing the facts.' / 'Nothing can justify treating people unfairly.' You can also use 'justify + noun': 'Can you justify the extra cost?' Avoid 'justify to do' — use 'justify doing' instead.
What does 'the end justifies the means' mean?
This is a well-known English idiom meaning that a good result makes it acceptable to use bad or dishonest methods to achieve it. For example, lying to protect someone could be seen as 'the end justifying the means'. It is often used in ethical and philosophical discussions.
What is the noun form of justify?
The noun form is justification. 'He offered no justification for his actions.' The plural justifications is used when listing several reasons: 'The report listed several justifications for the policy change.' The word justification is common in academic, legal, and business writing.
What is the difference between justify and defend?
Both words involve arguing that something is acceptable, but defend often suggests protecting a position against attack: 'She defended her research against criticism.' Justify focuses more on providing evidence or logic that something was right: 'He justified the price increase with data.' In practice they often overlap.
Can 'justify' be used in academic writing?
Yes, justify is very common and appropriate in academic writing. It signals that you are not just stating an opinion but providing evidence for it: 'This paper will justify the use of qualitative methods.' 'The findings justify further research.' It adds an authoritative, logical tone to your writing.
What does 'justified text' mean in formatting?
In typography and word processing, justified text means text that is aligned along both the left and right margins, creating a clean, even block of text. This is a separate meaning of justify from the verb meaning 'to give reasons'. Both come from the Latin 'justificare' (to make righteous or correct).
How can I practise using justify in English?
LexFizz's Complete the Sentence exercise includes argument and opinion vocabulary like justify. Try Flash Cards to review justify alongside related B2 words such as defend, support, and explain. Practise writing one sentence a day using 'I justified...' or 'This justifies...' to build natural fluency.