Bu huyun tam bir rezalet.

Not exactly.

Huy usually means a person’s disposition, temperament, characteristic way of behaving, or ingrained trait. Depending on context, it can also be translated as habit.

Alışkanlık is more like a learned or repeated habit in the everyday sense, such as biting your nails or drinking coffee every morning.

So in this sentence, huy suggests something a bit more personal and deep-rooted than just a routine habit. A natural English translation might be:

• this habit of yours
• this trait of yours
• this behavior of yours

The best choice depends on context.

Because -un here is the 2nd person singular possessive suffix, meaning your.

So:

• huy = habit / trait / disposition
• huyun = your habit / your trait

This is why Bu huyun means this habit of yours or this trait of yours.

The suffix appears as -ın, -in, -un, -ün depending on vowel harmony. Since huy contains u, the correct form is -un:

• huy + un = huyun

It may look strange from an English point of view, but it is completely normal in Turkish.

Bu huyun literally looks like this your trait, but the natural English equivalent is:

• this habit of yours
• this trait of yours

Turkish often combines a demonstrative like bu with a possessive form like huyun. It points to a specific thing that belongs to or is associated with the person being addressed.

So:

• bu kitap = this book
• kitabın = your book
• bu kitabın can mean this book of yours in the right context

Likewise:

• bu huyun = this trait/habit of yours

In Turkish, present-tense to be is often not expressed in 3rd-person nominal sentences.

So:

• Bu huyun tam bir rezalet. literally = This habit of yours a complete disgrace. but naturally = This habit of yours is a complete disgrace.

This is normal Turkish grammar.

If you want a more formal or emphatic version, Turkish can add the copular ending -dır / -dir / -dur / -dür:

• Bu huyun tam bir rezalettir.

That sounds more formal, stiff, or emphatic than the version without it.

Tam bir is an intensifying expression. It means something like:

• a complete
• a total
• an absolute

So:

• tam bir rezalet = a complete disgrace
• a total embarrassment
• an absolute mess
  depending on context

Here, tam adds force. It makes the criticism stronger.

Compare:

• bir rezalet = a disgrace
• tam bir rezalet = a complete / total disgrace

Here, rezalet is basically a noun.

It means things like:

• disgrace
• scandal
• shame
• sometimes mess or awful situation, depending on context

In this sentence, it functions as a predicate noun:

• Bu huyun = subject
• tam bir rezalet = predicate

So the structure is like:

• This trait of yours = a complete disgrace

In colloquial Turkish, rezalet can sometimes feel almost adjective-like in translation, but grammatically here it is best understood as a noun.

Here bir works much like a/an in English:

• bir rezalet = a disgrace

In the phrase tam bir rezalet, bir is part of a very common pattern:

• tam bir şaka = a complete joke
• tam bir felaket = a total disaster
• tam bir rezalet = a total disgrace

So even though bir can also mean one, here it is functioning more like the indefinite article a/an.

Yes. It is quite strong and clearly disapproving.

Saying Bu huyun tam bir rezalet is not mild criticism. It sounds like:

• This habit of yours is disgraceful
• This behavior of yours is a complete disgrace

So it can sound angry, harsh, or condemning.

If you wanted to say something softer, you might use sentences like:

• Bu huyun hiç hoş değil. = This habit of yours is not nice at all.
• Bu davranışın doğru değil. = This behavior of yours isn’t right.
• Bu alışkanlığını sevmiyorum. = I don’t like this habit of yours.

Yes, but the given order is the most straightforward and neutral one.

Normal order:

• Bu huyun tam bir rezalet.

This presents bu huyun as the topic/subject and tam bir rezalet as what is being said about it.

You may also hear different orders for emphasis, for example:

• Tam bir rezalet bu huyun.

That sounds more emotional or emphatic, something like:

• This habit of yours is a total disgrace.

So the original order is a good standard pattern to learn, while other orders are usually used for emphasis, tone, or style.