Sydämeni on terve.

Sydämeni = sydän + -i- + -ni

• sydän = heart
• -ni = my (a possessive suffix)
• the -i- appears because the word changes form before the possessive ending

So sydämeni means my heart.

The dictionary form is sydän, but when endings are added, the stem changes:

• sydän → sydäme-
• so: sydäme- + ni → sydämeni

This is a very common type of stem change in Finnish.

In Finnish, possession is often shown with a possessive suffix attached to the noun.

So instead of saying only:

• minun sydän ❌

Finnish normally says:

• sydämeni = my heart

You can also say:

• minun sydämeni

That version is more explicit and can sound more emphatic, but the suffix -ni already gives the meaning my, so minun is often unnecessary.

Because terve is an adjective whose basic form is already terve.

In this sentence, terve is a predicate adjective after on (is), and predicate adjectives are usually in the basic nominative form in Finnish when the subject is singular.

So:

• Sydämeni on terve. = My heart is healthy.

Not:

• terveä ❌

The form terveä can appear in other grammatical contexts, but not here.

On is the third-person singular form of the verb olla (to be).

So:

• olen = I am
• olet = you are
• on = he/she/it is

Since sydämeni (my heart) is singular, Finnish uses:

• Sydämeni on terve.

In this sentence, terve means healthy or in good condition.

It can be used for:

• people
• body parts
• animals
• sometimes things or systems, in a more extended sense

For example:

• Lapsi on terve. = The child is healthy.
• Sydän on terve. = The heart is healthy.

But terve can also appear in greetings, such as:

• Terve! = Hi! / Hello!

So the exact meaning depends on context.

Because the possessive suffix is attached to the noun, not the adjective.

In:

• Sydämeni on terve.

the possession is part of sydämeni (my heart).
The adjective terve simply describes the subject and stays in its normal predicate form.

Finnish does have adjective agreement in many situations, but here the important thing is:

• the noun carries the possessive meaning
• the adjective does not need a possessive suffix

So not:

• terveni ❌

Yes. That is correct.

Compare:

• Sydämeni on terve.
• Minun sydämeni on terve.

Both mean My heart is healthy.

The second version includes both:

• the pronoun minun = my
• the possessive suffix -ni

This combination is normal in Finnish, especially when you want to be clear, contrastive, or emphatic.

It is in the nominative.

Why? Because it is the subject of the sentence:

• Sydämeni = the thing being talked about
• on terve = is healthy

So the basic sentence structure is:

• subject
  • on
    • predicate adjective

Even though sydämeni has a possessive suffix, it is still functioning here as a nominative subject.

This is part of Finnish noun inflection. The word sydän belongs to a type where the stem changes before many endings.

You can think of it like this:

• dictionary form: sydän
• stem used with endings: sydäme-

Examples:

• sydän = heart
• sydämen = heart’s / of the heart
• sydäntä = heart (partitive)
• sydämessä = in the heart
• sydämeni = my heart

So the -n at the end of the dictionary form does not simply stay unchanged in all forms.

The most neutral word order is:

• Sydämeni on terve.

Finnish word order is more flexible than English word order, but changing it changes the emphasis.

For example:

• Sydämeni on terve. = neutral
• Terve on sydämeni. = more poetic or marked
• On sydämeni terve? = archaic/literary sounding as a statement; as a question, Finnish would normally change intonation or use question particles

So for ordinary use, Sydämeni on terve. is the natural choice.

A simple pronunciation guide is:

sy-dä-me-ni

Some helpful points:

• y is not like English y in yes; it is a front rounded vowel, somewhat like German ü
• ä is like the vowel in British cat for many speakers, though not exactly the same
• stress in Finnish is almost always on the first syllable

So the stress is:

• SY-dä-me-ni

And terve is:

• TER-ve

Yes, potentially.

Just like English heart, Finnish sydän can refer to:

• the physical organ
• emotions, love, or one’s inner self

In this particular sentence, because the adjective is terve (healthy), the physical meaning is the most natural:

• My heart is healthy.

But in other contexts, sydän can definitely be metaphorical too.

Yes. It is short, grammatical, and natural.

It sounds like a straightforward statement, for example in a medical or descriptive context:

• Sydämeni on terve. = My heart is healthy.

Finnish often allows very compact sentences like this, especially because information such as possession can be built directly into the noun with suffixes.