Постер глянцевый.

In Russian, the verb to be is usually omitted in the present tense.

So:

• Постер глянцевый. = The poster is glossy.

In the past or future, Russian does use a form of to be:

• Постер был глянцевым. = The poster was glossy.
• Постер будет глянцевым. = The poster will be glossy.

So the missing is is completely normal.

Because this sentence means The poster is glossy, not a glossy poster.

Compare:

• глянцевый постер = a glossy poster
  
  • here the adjective directly describes the noun inside one noun phrase
• Постер глянцевый = The poster is glossy
  
  • here глянцевый is part of the predicate

So word order helps show the difference between:

• what something is called/described as
  and
• what is being said about it

Yes, but it would usually mean glossy poster, not a full sentence by itself in the same way.

• Глянцевый постер = a glossy poster
• Постер глянцевый = The poster is glossy

If you just say Глянцевый постер. as a standalone utterance, it may sound like a label, a heading, or a shortened context-dependent sentence, but the basic grammatical meaning is still more like glossy poster.

Because it agrees with постер, which is:

• masculine
• singular
• nominative

Russian adjectives must agree with the noun they describe.

Here are some matching forms:

• постер глянцевый — masculine singular
• книга глянцевая — feminine singular
• окно глянцевое — neuter singular
• журналы глянцевые — plural

So -ый is the masculine singular nominative ending here.

A noun like постер is masculine because it ends in a consonant in its dictionary form.

That is a very common pattern in Russian:

• nouns ending in a consonant are often masculine
• nouns ending in -а / -я are often feminine
• nouns ending in -о / -е are often neuter

So:

• постер → masculine
  and therefore:
• глянцевый must also be masculine

Yes, absolutely.

Russian often forms sentences like:

• Дом большой. = The house is big.
• Кофе горячий. = The coffee is hot.
• Постер глянцевый. = The poster is glossy.

This is a standard and complete sentence pattern:
noun + adjective, with the present-tense to be understood.

Russian has no articles.

So постер can mean:

• a poster
• the poster

The exact meaning depends on context.

That means:

• Постер глянцевый could mean The poster is glossy
• in some contexts it could also be understood as A poster is glossy, though that is less likely in normal translation

Usually English translations choose the or a based on the situation, not because Russian explicitly says it.

Yes. Глянцевый commonly means glossy, shiny-coated, or printed on glossy paper, depending on context.

For example:

• глянцевый журнал = a glossy magazine
• глянцевая бумага = glossy paper
• глянцевый постер = a glossy poster

So in this sentence it most naturally refers to the poster having a glossy surface or finish.

In principle, Russian sometimes uses short-form adjectives in predicate position, for example:

• дом красив / more commonly дом красивый
• она готова

But with глянцевый, the full form глянцевый is the normal and natural choice here.

So for this sentence, learners should simply use:

• Постер глянцевый.

That is the standard way to say it.

They are both in the nominative case.

That is because:

• постер is the subject
• глянцевый agrees with it in gender, number, and case

So:

• постер — nominative singular masculine
• глянцевый — nominative singular masculine

This is very common in present-tense sentences with a noun and adjective.

A natural pronunciation is:

• По́стер гля́нцевый.

Stress:

• по́стер
• гля́нцевый

A rough English-style approximation would be:

• POHS-ter GLYAN-tse-vy

But it is best to hear native audio if possible, especially for:

• гл at the start of глянцевый
• the я sound after гл
• the unstressed vowels, which are reduced in normal speech

No, it is a loanword, borrowed from English poster.

Russian also has плакат, which often means poster too. The difference is mostly about usage and nuance:

• плакат often sounds more traditional or general
• постер often suggests a modern printed poster, decorative wall poster, or commercial/media-style poster

So Постер глянцевый sounds quite natural, especially in modern everyday usage.