העמית החדש שלי שקט, והעמיתה החדשה שלי מדברת יותר, אבל שניהם נחמדים.

Because Hebrew nouns often have grammatical gender.

• עמית = a male colleague / a colleague in the masculine form
• עמיתה = a female colleague / a colleague in the feminine form

In this sentence:

• העמית החדש שלי = my new male colleague
• והעמיתה החדשה שלי = and my new female colleague

A very common feminine ending in Hebrew is ־ה, which is what you see in עמיתה.

Because adjectives in Hebrew must agree with the noun in gender and number.

Here:

• עמית is masculine singular, so חדש becomes החדש
• עמיתה is feminine singular, so חדשה becomes החדשה

So:

• העמית החדש = the new male colleague
• העמיתה החדשה = the new female colleague

This agreement is one of the most important patterns in Hebrew.

In Hebrew, when a noun is definite, its adjective usually becomes definite too.

So Hebrew says:

• העמית החדש literally: the colleague the-new
• העמיתה החדשה literally: the colleague the-new

That is normal Hebrew structure. If the noun is definite, the adjective usually takes ה־ as well.

Compare:

• עמית חדש = a new colleague
• העמית החדש = the new colleague

In Hebrew, possessive words like שלי usually come after the noun.

So Hebrew says:

• העמית החדש שלי = literally the colleague the-new of-mine
• העמיתה החדשה שלי = literally the colleague the-new of-mine

Also, שלי means my and does not change according to the gender of the thing possessed. It stays שלי whether the noun is masculine or feminine.

Examples:

• הספר שלי = my book
• המכונית שלי = my car

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

So:

• העמית החדש שלי שקט literally = my new colleague quiet
• natural English = my new colleague is quiet

The same idea appears later:

• שניהם נחמדים = both of them are nice

In the present tense, Hebrew normally leaves out is / are.

Because here שקט is a predicate adjective, not part of the noun phrase.

Compare these two ideas:

• העמית השקט = the quiet colleague
  Here quiet directly describes the noun inside the noun phrase, so it gets ה־.

• העמית שקט = the colleague is quiet
  Here quiet is what is being said about the colleague, so it does not take ה־.

In your sentence, שקט means is quiet, so no ה־ is used.

Because it refers to העמיתה החדשה שלי, which is feminine singular.

Hebrew present-tense verbs agree with gender and number. So:

• מדבר = masculine singular speaks / is speaking
• מדברת = feminine singular speaks / is speaking

Since the subject is a female colleague, the sentence uses מדברת.

יותר means more.

So מדברת יותר means talks more or speaks more.

In this sentence, the comparison is understood from context: the female colleague talks more than the male colleague.

Hebrew often allows this without explicitly saying than if the comparison is clear.

For example:

• הוא אוכל יותר = he eats more
• היא מדברת יותר = she talks more

Because in Hebrew, a mixed-gender group normally takes the masculine plural form.

So even though the two colleagues are:

• one male
• one female

Hebrew uses:

• שניהם = both of them (masculine form for mixed or masculine groups)

If both were female, you would say:

• שתיהן

This is a very common rule in Hebrew grammar.

Because נחמדים agrees with שניהם, which is masculine plural.

Since the sentence is talking about both of them, the adjective must be plural. And because the pair is mixed-gender, Hebrew uses the masculine plural form.

Forms of nice here are:

• נחמד = masculine singular
• נחמדה = feminine singular
• נחמדים = masculine plural
• נחמדות = feminine plural

So:

• שניהם נחמדים = both of them are nice

• ו־ means and
• אבל means but

So the structure is:

• העמית החדש שלי שקט = my new male colleague is quiet
• והעמיתה החדשה שלי מדברת יותר = and my new female colleague talks more
• אבל שניהם נחמדים = but both of them are nice

A small note: the ו־ is attached directly to the next word in Hebrew, so והעמיתה is and the female colleague.

Because that is the normal word order in Hebrew: noun + adjective.

So Hebrew usually says:

• עמית חדש = colleague new
• עמיתה חדשה = female-colleague new

This is different from English, where adjectives usually come before the noun.

Examples:

• בית גדול = a big house
• ילדה חכמה = a smart girl

So העמית החדש שלי follows normal Hebrew word order.

Yes. Hebrew present tense often covers both simple present and present progressive.

So מדברת can mean:

• talks
• is talking
• speaks
• is speaking

Which English version sounds best depends on context. In a general description like this, talks more is usually the most natural translation.

It is a correct and common word, especially in somewhat neutral or formal usage.

Another very common word is:

• חבר לעבודה = male coworker
• חברה לעבודה = female coworker

So:

• עמית / עמיתה often feels a bit more like colleague
• חבר/ה לעבודה often feels more like coworker

Both are useful to know.