Kelantangan itu sama sekali tidak sesuai.

Kelantangan means volume, loudness, or sound level.

It comes from the adjective lantang, which means loud or clear-sounding.
With the ke-...-an pattern, it becomes a noun:

• lantang = loud, clear
• kelantangan = loudness, volume

So in this sentence, kelantangan itu refers to that volume or the volume in question.

Itu often means that, but in many sentences it also works like a definiteness marker, similar to the in English.

So kelantangan itu can mean:

• that volume
• the volume
• that loudness level we are talking about

Malay often puts itu after the noun:

• buku itu = that book / the book
• suara itu = that voice / the voice
• kelantangan itu = that volume / the volume

So this is normal Malay word order.

Malay usually does not need a verb like is / are / am in this kind of sentence.

English says:

• The volume is not suitable

Malay simply says:

• Kelantangan itu tidak sesuai

This is very common with adjectives and noun phrases in Malay. The adjective can act directly as the predicate.

Other examples:

• Dia tinggi = He is tall
• Rumah itu besar = The house is big
• Jawapan itu betul = The answer is correct

So there is no missing word here. The sentence is complete as it is.

Sama sekali is an intensifier. In this sentence, it makes the negation stronger.

So sama sekali tidak sesuai means something like:

• not suitable at all
• completely unsuitable
• in no way appropriate

It adds emphasis, not a new basic meaning.

Compare:

• tidak sesuai = not suitable
• sama sekali tidak sesuai = not suitable at all

Use tidak to negate verbs and adjectives. Use bukan mainly to negate nouns or noun phrases.

Since sesuai is functioning as an adjective here, tidak is correct:

• tidak sesuai = not suitable

Compare:

• Dia tidak tinggi = He is not tall
• Itu tidak benar = That is not true
• Dia bukan guru = He is not a teacher

So bukan sesuai would sound wrong in standard Malay.

Sesuai usually means suitable, appropriate, or fitting. In this sentence, it behaves like an adjective.

So:

• tidak sesuai = not suitable / inappropriate

You can also see it in other patterns:

• sesuai untuk kanak-kanak = suitable for children
• tidak sesuai dengan keadaan itu = not suitable for that situation

A useful point for learners: Malay adjectives often work very naturally as predicates, so sesuai can appear directly after the subject without any word for is.

It can move somewhat, though some positions sound more natural than others.

Your sentence:

• Kelantangan itu sama sekali tidak sesuai

This is natural and emphasizes the strong negation.

You may also hear:

• Kelantangan itu tidak sesuai sama sekali

This is also natural and very common, especially in speech and writing.

Both mean essentially the same thing: the volume is not suitable at all.

So sama sekali is fairly flexible, but it is most often used close to the negative part of the sentence.

Usually, learners first meet sama sekali in negative sentences, where it means at all or completely:

• tidak faham sama sekali = do not understand at all
• sama sekali tidak sesuai = completely unsuitable

In modern usage, it is much more common with negation. If you are a learner, the safest rule is:

• use sama sekali mainly with tidak or another negative idea

That will sound natural in most situations.

Kelantangan is correct Malay and is used in formal or careful language. But in everyday conversation, many speakers also use volume, especially when talking about TV, phones, speakers, or music systems.

So you might hear both:

• Kelantangan itu terlalu tinggi
• Volume itu terlalu kuat

In casual speech, borrowed words are very common. Kelantangan sounds a bit more formal or standard.

Most commonly, yes. It refers to loudness or volume level.

Depending on context, it can describe:

• the volume of a voice
• the sound level of music
• the loudness of a device

It is generally about how loud something is, not about physical size or quantity.

It sounds natural, clear, and somewhat neutral-to-formal.

Kelantangan itu sama sekali tidak sesuai would fit well in contexts like:

• giving feedback
• discussing audio settings
• making a polite but firm judgment
• formal writing or careful speech

In more casual spoken Malay, someone might say:

• Volume tu memang tak sesuai
• Terlalu kuat
• Tak sesuai langsung

So the original sentence is perfectly good Malay, but it sounds a little more polished than very casual everyday speech.

Yes. Even if the meaning is already known, it is useful to see the range.

Possible English renderings include:

• That volume is not suitable at all.
• The volume is completely inappropriate.
• That loudness level is totally unsuitable.
• The volume is far from appropriate.

The exact best translation depends on context, but the Malay structure stays the same: subject + strong negation + adjective.