Rachunek jest niezbyt duży.

In this sentence, rachunek most likely means bill or check — for example, in a restaurant, hotel, or for a service.

But rachunek can also mean other things in Polish depending on context, such as:

• a bill / check
• an account
• a calculation
• a score to settle in some expressions

So in Rachunek jest niezbyt duży, the natural interpretation is The bill is not very big / The bill is not too high.

Jest is the 3rd person singular form of być (to be), so it means is.

• rachunek = the bill
• jest = is
• niezbyt duży = not very big

So the structure is simply:

Rachunek jest niezbyt duży.
= The bill is not very big.

Unlike in some languages, in Polish you normally do use the present tense of być in this kind of sentence.

Niezbyt means not very, not particularly, or sometimes rather not very.

So:

• niezbyt duży = not very big
• niezbyt drogi = not very expensive
• niezbyt ciekawy = not very interesting

It softens the adjective instead of making a strong negative statement.

Compare:

• duży = big
• bardzo duży = very big
• niezbyt duży = not very big

It sounds milder than a direct negative.

Because duży has to agree with rachunek in gender, number, and case.

Rachunek is:

• singular
• masculine inanimate
• nominative here

So the adjective must also be masculine singular nominative:

• masculine: duży
• feminine: duża
• neuter: duże

Examples:

• rachunek jest duży — the bill is big
• książka jest duża — the book is big
• okno jest duże — the window is big

Not necessarily. With rachunek, duży usually refers to the amount of the bill, not its physical size.

So even though duży literally means big/large, in this context English would often say:

• The bill is not very high
• The bill is not too large
• The bill isn’t very big

Polish often uses duży in cases where English prefers high or large in amount.

Yes, in many contexts wysoki rachunek can sound very natural too, especially when talking about a bill being high in amount.

Compare:

• duży rachunek = a big bill
• wysoki rachunek = a high bill

Both can work, but duży is very common and natural.

So you might also hear:

• Rachunek nie jest zbyt wysoki.
• To nie jest wysoki rachunek.

They are similar, but not exactly identical.

1. niezbyt duży

This means not very big / not particularly big.

• Rachunek jest niezbyt duży.

2. nie jest zbyt duży

This means isn’t too big.

• Rachunek nie jest zbyt duży.

This version may sound a bit more natural to many learners because it lines up well with English isn’t too big.

3. nie za duży

This means something like not too big as well, but it is often used more in spoken language and can sound a bit more colloquial depending on context.

So the sentence in your example is correct, but a learner should know that Polish has several similar ways to express this idea.

Yes, it is grammatical and understandable.

That said, depending on context, many speakers might more often say:

• Rachunek nie jest zbyt duży.
• To niezbyt duży rachunek.

Your sentence, Rachunek jest niezbyt duży, is fine, but niezbyt often feels especially natural directly before an adjective, and many speakers may prefer slightly different word order in everyday conversation.

Normally, no — not in a full standard sentence like this.

Polish does sometimes omit to be in certain constructions, but here jest is normally needed:

• Rachunek jest niezbyt duży. — correct
• Rachunek niezbyt duży. — sounds incomplete as a normal statement

Without jest, it could sound like a note, headline, or fragment rather than a complete sentence.

Because it is the subject of the sentence.

In Rachunek jest niezbyt duży:

• Rachunek = the subject
• jest = the verb
• niezbyt duży = the description of the subject

Subjects in Polish are typically in the nominative case, so rachunek appears in nominative singular.

A rough pronunciation guide is:

ra-HOO-nek yest NYEZ-bit DOO-zhy

A few useful pronunciation notes:

• ch in rachunek sounds like a hard h sound
• je in jest sounds like ye
• niezbyt starts with nyez
• ż in duży sounds like the s in measure

A more careful breakdown:

• Rachunek → ra-HOO-nek
• jest → yest
• niezbyt → NYEZ-bit
• duży → DOO-zhy

Technically yes, because rachunek can mean account in some contexts. But in this exact sentence, without extra context, most people would probably first understand it as bill/check.

If you wanted to make account clearer, context would usually do that. For example:

• Rachunek bankowy = bank account
• Rachunek za obiad = bill for lunch
• Rachunek matematyczny = calculation

So the meaning depends strongly on the situation.

Possible translations include:

• The bill is not very big.
• The bill isn’t very large.
• The bill is not too high.
• The bill isn’t too big.

The best English version depends on what kind of natural English you want:

• not very big matches niezbyt duży closely
• not too high may sound more idiomatic if you are talking about money

So even if the Polish uses duży, English may prefer high in some contexts.