הוא קצת ביישן, אבל הוא תמיד מנומס.

Yes. Hebrew often repeats the subject pronoun for clarity or emphasis, especially after אבל (but).

So both of these are natural:

• הוא קצת ביישן, אבל הוא תמיד מנומס.
• הוא קצת ביישן, אבל תמיד מנומס.

The version with the second הוא sounds a little more explicit and balanced, like English He is a little shy, but he is always polite.

In present-tense Hebrew, the verb to be is usually omitted.

So:

• הוא ביישן = He is shy
• הוא מנומס = He is polite

Hebrew normally does not say a separate present-tense is/am/are in sentences like this.

קצת means a little, a bit, or somewhat.

In this sentence:

• הוא קצת ביישן = He is a little shy

It comes before the adjective it modifies. That is a very common pattern:

• קצת עייף = a little tired
• קצת עצוב = a little sad

It softens the description, just like a little or kind of can in English.

ביישן means shy.

It is an adjective, and here it is masculine singular because it describes הוא (he).

Forms:

• ביישן = masculine singular
• ביישנית = feminine singular

Examples:

• הוא ביישן = He is shy
• היא ביישנית = She is shy

Yes. מנומס means polite or well-mannered, and it is also an adjective.

In this sentence it is masculine singular, matching הוא.

Forms:

• מנומס = masculine singular
• מנומסת = feminine singular

Examples:

• הוא מנומס = He is polite
• היא מנומסת = She is polite

Hebrew adjectives do not all share one single masculine ending. Different adjectives have different base patterns.

So both of these are masculine singular, even though they look different:

• ביישן
• מנומס

What matters is how each adjective changes across gender and number, not whether all masculine adjectives end the same way.

For example:

• ביישן / ביישנית
• מנומס / מנומסת

So the two words belong to different adjective patterns, but both correctly agree with הוא.

אבל means but.

It connects two contrasting ideas:

• הוא קצת ביישן = He is a little shy
• אבל הוא תמיד מנומס = but he is always polite

It usually comes between the two parts of the sentence, just like English but.

תמיד means always.

In this sentence:

• הוא תמיד מנומס = He is always polite

Placing תמיד before the adjective is very natural in Hebrew. It functions a bit like an adverb modifying the whole description.

You will often see this pattern:

• הוא תמיד עייף = He is always tired
• היא תמיד שמחה = She is always happy

You would change the pronoun and the adjectives to feminine forms:

• היא קצת ביישנית, אבל היא תמיד מנומסת.

Changes:

• הוא → היא (he → she)
• ביישן → ביישנית
• מנומס → מנומסת

This is because Hebrew adjectives must agree with the gender of the person they describe.

A simple pronunciation guide is:

Hu ktsat bay-shan, aval hu tamid menumas.

A few notes:

• הוא = hu
• קצת = ktsat or ktsat
• ביישן = roughly bay-SHAN
• אבל = a-VAL
• תמיד = ta-MID
• מנומס = me-nu-MAS

Stress is usually near the end in:

• ביישן
• אבל
• תמיד
• מנומס

Not in this kind of sentence.

Here, ביישן and מנומס are predicate adjectives, meaning they come after the subject:

• הוא ביישן
• הוא מנומס

That is like saying He is shy and He is polite.

If you are describing a noun directly, Hebrew adjectives usually come after the noun, not before it:

• ילד ביישן = a shy boy
• איש מנומס = a polite man

So unlike English, Hebrew usually places adjectives after the noun they describe.

The comma before אבל is standard and helpful because it separates the two clauses:

• הוא קצת ביישן, אבל הוא תמיד מנומס.

In informal writing, people may sometimes be less strict with punctuation, but using the comma here is normal and recommended.

Usually no. In this sentence, קצת most naturally means a little or a bit.

So:

• הוא קצת ביישן = He is a little shy

If you translated it as quite shy, that would usually sound stronger than the Hebrew. קצת normally softens the statement, not intensifies it.