Zahvaljujući toplom čaju i kratkom odmoru, glas joj je večeras mirniji.

In this sentence, zahvaljujući means thanks to or due to.

It normally goes with the dative case, which is why you get:

• toplom čaju
• kratkom odmoru

So the structure is:

• zahvaljujući + dative

Examples:

• Zahvaljujući prijatelju, uspio sam. = Thanks to a friend, I succeeded.
• Zahvaljujući kiši, vrt izgleda bolje. = Thanks to the rain, the garden looks better.

In this sentence, the idea is that the warm tea and short rest are the reason her voice is better.

They are in the dative singular, because zahvaljujući requires the dative.

Breakdown:

• topli čaj = warm tea
  → dative singular: toplom čaju
• kratak odmor = short rest
  → dative singular: kratkom odmoru

Both the adjective and the noun change to match the dative case.

So:

• topli → toplom
• čaj → čaju
• kratak → kratkom
• odmor → odmoru

This is a very common thing in Croatian: adjectives must agree with the noun in case, gender, and number.

Historically, it comes from a verb form related to zahvaljivati / zahvaliti, but in sentences like this it behaves much like a preposition-like expression meaning thanks to.

A learner usually does not need to think of it as a normal verb here. The most practical thing to remember is:

• zahvaljujući = thanks to
• it is followed by the dative

So in real usage, it works more like a fixed expression than like a full verb.

Because that opening part is an introductory phrase giving the cause or circumstance for the main clause.

The sentence has this structure:

• Zahvaljujući toplom čaju i kratkom odmoru,
  introductory cause phrase
• glas joj je večeras mirniji.
  main clause

The comma helps separate the setup from the main statement. In writing, this is very natural and common.

Both are possible, but they are not used in exactly the same way.

• glas joj je... = literally something like the voice to her is..., but naturally it means her voice is...
• njezin glas je... = her voice is... with a more explicit possessive adjective

Croatian often prefers short clitic pronouns like joj in places where English would use her.

So:

• glas joj je večeras mirniji sounds very natural and fluid
• njezin glas je večeras mirniji is also correct, but a bit more explicit or slightly heavier

This is a common pattern:

• Ruka me boli. = My arm hurts.
• Oči joj sjaje. = Her eyes are shining.

Joj is the dative singular form of the pronoun ona.

Forms of ona include:

• nominative: ona = she
• accusative/genitive: nju / je
• dative/locative: njoj / joj

Here joj is a clitic form, which means a short unstressed pronoun that tends to appear in a fixed position in the sentence.

In glas joj je večeras mirniji, joj means to her / her, and Croatian uses this dative clitic to express possession in a very natural way.

Mirniji is the comparative form of miran.

• miran = calm, quiet
• mirniji = calmer, quieter

Croatian often uses the comparative without saying the second half explicitly. So the sentence implies something like:

• her voice is calmer than before
• her voice is calmer than it was earlier
• her voice is calmer than usual

English can do this too:

• She seems better tonight.
• His voice is calmer now.

So even though no than... phrase appears, the comparison is understood from context.

It is the comparative of miran.

The basic pattern is:

• miran → mirniji

This kind of adjective change is very common in Croatian, although the exact formation varies from adjective to adjective.

Here mirniji agrees with glas, which is:

• masculine
• singular
• nominative

So the masculine singular form of the comparative is used.

If the noun were different, the ending would change:

• glas je mirniji = the voice is calmer
• ruka je mirnija = the hand is calmer
• more je mirnije = the sea is calmer

It can suggest both, depending on context.

Because the noun is glas = voice, mirniji can mean:

• calmer
• softer
• steadier
• less strained
• sometimes quieter

A literal dictionary translation is not always enough here. In this sentence, it probably means that her voice sounds more settled and less irritated or tense, likely because of the tea and rest.

So a learner should think of it as a natural context-based adjective, not something with only one rigid English equivalent.

Yes, the word order could be different. Croatian word order is fairly flexible.

Here:

• glas joj je večeras mirniji

puts večeras in a natural position before the adjective, so the sentence flows smoothly.

You could also hear or read things like:

• Večeras joj je glas mirniji.
• Glas je joj večeras mirniji. — this one is not natural because clitics should not be placed like that
• Joj je glas večeras mirniji. — possible in special contexts, but less neutral

The important thing is that joj and je are clitics, and clitics in Croatian have strong placement rules. In a neutral sentence, glas joj je večeras mirniji sounds very natural.

Because both are clitics, and Croatian clitics usually gather in a special position near the beginning of the clause.

Here:

• joj = to her / her
• je = is

So:

• glas joj je večeras mirniji

follows a very typical Croatian pattern where short unstressed words cluster together.

This is one reason Croatian word order can feel unusual to English speakers. English says:

• her voice is calmer tonight

Croatian often organizes the sentence around clitic placement rather than strict subject-verb order.

Yes. You could say:

• Zahvaljujući toplom čaju i kratkom odmoru, njezin je glas večeras mirniji.

That is correct.

But there is a nuance:

• glas joj je sounds very natural and conversational
• njezin je glas sounds a bit more explicit, and can sometimes add slight emphasis to her

Croatian often prefers the shorter clitic-based structure unless there is a reason to stress the possessor.

A helpful breakdown is:

• Zahvaljujući toplom čaju i kratkom odmoru = cause/reason phrase
• glas = subject
• joj = dative clitic expressing possession
• je = verb to be
• večeras = time expression
• mirniji = predicate adjective in the comparative

So the whole thing is:

• Thanks to warm tea and a short rest, her voice is calmer this evening.

This is a good example of several very common Croatian features at once:

• dative after zahvaljujući
• clitic pronouns
• flexible word order
• comparative adjective without an explicit than phrase