Cheia este undeva în casă.

Cheie is the basic dictionary form and means key.
Cheia means the key.

Romanian usually puts the definite article at the end of the noun instead of using a separate word like English the:

• cheie = a key / key
• cheia = the key

So Cheia este... means The key is...

Cheie is a feminine noun in Romanian. That matters because the form of the definite article depends on gender and number.

Here, feminine singular cheie becomes cheia for the key.

In this sentence, you mostly notice the gender through that definite form.

Este means is. It is the 3rd person singular form of the verb a fi, which means to be.

So:

• Cheia = the key
• este = is
• undeva = somewhere
• în casă = in the house / inside the house

Yes. E is a very common shorter form of este in everyday Romanian.

So these both work:

• Cheia este undeva în casă.
• Cheia e undeva în casă.

The second one is a little more conversational and very natural in speech.

Undeva means somewhere. It is an adverb of place.

In this sentence, it tells you that the exact location is unknown:

• Cheia este undeva în casă. = The key is somewhere in the house.

It does not specify where in the house, only that it is there.

This is a very common question.

In Romanian, expressions of place often use a noun without the definite article where English would naturally say the. So în casă can very naturally mean in the house / inside the house, depending on context.

Also, în casă is a very common expression meaning inside the house / indoors.

You often see în casa... when the noun is followed by something more specific, for example:

• în casa mea = in my house
• în casa vecinului = in the neighbor’s house

So in this sentence, în casă is normal and idiomatic.

It can mean either, depending on context.

Here it means in, because the sentence describes a location, not movement:

• Cheia este în casă. = The key is in the house.

With movement, în can correspond to into:

• Intru în casă. = I am going into the house.

So the verb helps you understand whether it is location or movement.

The word order here is the most neutral and natural one:

• Cheia este undeva în casă.

Romanian word order is fairly flexible, but changing it can change the emphasis or make it sound more literary or marked.

For example:

• Undeva în casă este cheia.

This is understandable, but it sounds more marked, as if emphasizing somewhere in the house.

For normal everyday speech, Cheia e/este undeva în casă is the best choice.

A rough pronunciation guide is:

• Cheia ≈ KEH-ya
• este ≈ YES-te
• undeva ≈ oon-deh-VA
• în = a vowel sound that does not exist exactly in English
• casă ≈ KAH-suh

So the whole sentence is roughly:

KEH-ya YES-te oon-deh-VA în KAH-suh

A more exact pronunciation would be:

• cheia = /ˈke.ja/
• este = /ˈjes.te/
• undeva = /un.deˈva/
• în = /ɨn/
• casă = /ˈka.sə/

They are important because they change pronunciation.

• î in în is a Romanian vowel with no exact English equivalent. It is a close central sound, written /ɨ/.
• ă in casă is a schwa, the same kind of sound as the first vowel in English about.

So:

• în is not the same as English in
• casă is not casa with a normal a at the end

These diacritics are part of standard Romanian spelling and should be learned early.

Yes. Very often în casă means inside the house or more generally indoors, as opposed to afară meaning outside.

In this sentence, it means that the key is somewhere inside the house. That is why English naturally translates it as somewhere in the house.