jogeoni an majaseo gyeyageul chwisohaesseoyo.

In this sentence, 조건 means conditions, terms, or requirements.

So 조건이 안 맞아서 means something like:

• because the conditions didn't match
• because the terms weren't acceptable
• because the requirements didn't line up

In a contract context, 조건 often refers to the deal terms, such as price, schedule, responsibilities, or other agreed conditions.

이 is the subject marker. It attaches to nouns ending in a consonant, so:

• 조건 + 이 → 조건이

Here, 조건이 안 맞다 means the conditions don't match / aren't right.

A learner-friendly way to think about it is that 조건 is the thing being described as not matching.

맞다 has several meanings in Korean, and one very common meaning is to fit, to match, or to be suitable/correct.

So:

• 맞다 = to match / to fit / to be right
• 안 맞다 = to not match / to not fit / to be unsuitable

In this sentence, 조건이 안 맞다 does not mean something is physically fitting into a space. It means the terms or conditions were not compatible or acceptable.

Examples:

• 성격이 안 맞아요. = Our personalities don't match.
• 시간이 안 맞아요. = The timing doesn't work.
• 조건이 안 맞아요. = The terms don't work / The conditions don't match.

안 is the standard short negation placed before a verb or adjective.

So:

• 맞다 = to match
• 안 맞다 = to not match

This is very common in everyday speech.

You could also say:

• 조건이 맞지 않아서 계약을 취소했어요.

This means basically the same thing, but 맞지 않아서 sounds a bit more formal or written than 안 맞아서.

-아서 / -어서 connects two actions or clauses and often means because or and so.

Here:

• 조건이 안 맞아서 = because the conditions didn't match
• 계약을 취소했어요 = I canceled the contract

Together:

• 조건이 안 맞아서 계약을 취소했어요.
• Because the conditions didn't match, I canceled the contract.

So in this sentence, -아서 is expressing a reason.

The base pattern is:

• 맞다 → 맞아서
• 안 맞다 → 안 맞아서

This clause is not the end of the sentence. It connects to the next clause, so it uses the connective form -아서.

The sentence ends with the final verb:

• 취소했어요

That is where the politeness level is shown.

If you ended the reason clause by itself in conversation, you might hear:

• 조건이 안 맞아서요.

That sounds like It's because the conditions didn't match... and is often used when the rest is understood from context.

It breaks down like this:

• 계약 = contract
• 을 = object marker
• 취소하다 = to cancel
• 취소했어요 = canceled / have canceled

So:

• 계약을 취소했어요 = I canceled the contract

This is a very common noun + 하다 verb:

• 취소 = cancellation
• 취소하다 = to cancel

을/를 marks the direct object of the verb.

Since 계약 ends in a consonant, it takes 을:

• 계약 + 을 → 계약을

This shows that the contract is the thing that was canceled.

Compare:

• 계약이 취소됐어요. = The contract was canceled.
  Here 계약이 is the subject.
• 계약을 취소했어요. = I canceled the contract.
  Here 계약을 is the object.

취소했어요 is the past tense polite form.

From:

• 취소하다 = to cancel

To:

• 취소했어요 = canceled / did cancel

So the whole sentence describes a completed past action:

• I canceled the contract because the conditions didn't match.

Also note that the first part, 조건이 안 맞아서, is understood in relation to that past event, so the whole sentence naturally refers to the past even though 안 맞아서 itself is not separately marked with -았-.

Korean often leaves out the subject when it is obvious from context.

So even though English usually says:

• I canceled the contract

Korean can simply say:

• 계약을 취소했어요

The listener usually understands who did it from the situation.

Depending on context, it could also be understood as:

• we canceled the contract
• our side canceled the contract

But in many textbook translations, I canceled the contract is the most natural default.

Not exactly.

• 조건이 안 맞아서 = because the conditions didn't match / weren't suitable
• 조건이 나빠서 = because the conditions were bad

The difference is important:

• 안 맞다 suggests the terms were not compatible, didn't align, or didn't work for the situation
• 나쁘다 means they were simply bad

So 안 맞아서 is often more natural when talking about negotiations, contracts, schedules, personalities, or requirements that fail to line up.

Yes, that is a very natural English interpretation.

A very direct translation is:

• Because the conditions didn't match, I canceled the contract.

But in smoother English, depending on context, you might also say:

• The terms didn't work out, so I canceled the contract.
• The deal fell through because the terms didn't match.
• Because we couldn't agree on the terms, I canceled the contract.

These are not word-for-word translations, but they capture the same idea well.

It is polite informal, often called the -어요 style.

The ending:

• 취소했어요

makes it polite and suitable for everyday conversation with someone you are not very close to, a customer, a coworker, or a stranger.

Compare:

• 조건이 안 맞아서 계약을 취소했어요. = polite
• 조건이 안 맞아서 계약을 취소했어. = casual
• 조건이 맞지 않아 계약을 취소했습니다. = more formal

So the original sentence is polite, natural, and common in spoken Korean.