Kysset var kort.

Because in this sentence, kysset is a noun, not a verb.

• et kys = a kiss
• kysset = the kiss

Danish often adds -et to a neuter noun to make it definite. So:

• et kys = a kiss
• kysset = the kiss

It is true that kysset can also be the past participle of at kysse (to kiss), meaning kissed, but that is not what it means here. In Kysset var kort, the sentence structure clearly shows that kysset is the subject noun: The kiss was short.

Because Danish usually makes a noun definite by adding an ending to the noun itself.

Here the basic noun is:

• et kys = a kiss

Since kys is a neuter noun (shown by et), the definite singular form is:

• kysset = the kiss

So this is the pattern:

• et hus → huset
• et brev → brevet
• et kys → kysset

This is different from English, which uses a separate word (the) instead of a noun ending.

Var is the past tense of at være (to be).

So:

• er = is / am / are
• var = was / were

In this sentence:

• Kysset var kort = The kiss was short

If you wanted the present tense, you would say:

• Kysset er kort = The kiss is short

Kort is an adjective, and here it is used after var, so it is a predicate adjective.

The noun kysset comes from et kys, which is a neuter noun. In Danish, adjectives often take -t with singular neuter nouns.

So:

• en kort film = a short film
• et kort kys = a short kiss

In your sentence, the adjective still matches the noun:

• Kysset var kort = The kiss was short

It is not kortet, because kortet would look like a definite form, but adjectives after er/var/bliver usually do not take the definite ending that way.

It is not korte, because korte is typically used with:

• plural nouns
• definite noun phrases with an adjective before the noun

For example:

• de korte kys = the short kisses

Yes. This is a very normal Danish sentence pattern:

• Subject + verb + adjective/complement

So:

• Kysset = subject
• var = verb
• kort = complement

This is the same basic order as in English:

• The kiss was short

Danish word order becomes more interesting when something else comes first in the sentence, because Danish follows the V2 rule in main clauses. But in this simple sentence, the order is completely straightforward.

Yes, grammatically you could, but it means something different.

• Et kys var kort = A kiss was short
• Kysset var kort = The kiss was short

The difference is indefinite vs definite:

• et kys = a kiss, any kiss
• kysset = the kiss, a specific kiss

In most real situations, Kysset var kort sounds more natural if you are talking about one particular kiss that both speaker and listener know about.

A learner usually notices the y, because it does not sound like English y.

A rough guide:

• kysset sounds approximately like KÜS-uhd or KÜS-et
• the first vowel y is a rounded front vowel, something English does not really have

Helpful tips:

• Say ee as in see
• Keep your tongue in a similar position
• Round your lips as if saying oo
• That gets you closer to Danish y

Also, the -et ending in natural speech is often reduced, so it may sound softer and less fully pronounced than an English learner expects.

Yes. In a sentence like this, kort can often be understood as short or brief, depending on context.

So Kysset var kort could mean:

• the kiss did not last long
• the kiss was brief

Danish kort is commonly used for duration as well as physical length, just like English short.

Most likely time/duration.

A kiss is something that happens over time, so kort here is normally understood as brief or short-lasting.

Even though kort can describe physical length in other contexts, in Kysset var kort the natural reading is:

• the kiss did not last long

Yes, very easily. It sounds like a natural sentence in narration or description.

For example:

• Kysset var kort, men intenst. = The kiss was short, but intense.
• Kysset var kort og akavet. = The kiss was short and awkward.

Because kysset is definite, it suggests a specific kiss already known in the context, which is very common in storytelling.