היא תמיד מנומסת, אפילו כשהיא כועסת, אבל אחותה אומרת שהיא לא עצלנית בכלל.

In Hebrew, the verb to be is usually not expressed in the present tense.

So:

היא תמיד מנומסת
literally looks like
she always polite

but it means
she is always polite.

The same thing happens in:

היא כועסת = she is angry
היא לא עצלנית = she is not lazy

If you want was / will be, then Hebrew does use forms of להיות.

Because the subject is היא = she, so the words describing her must be feminine singular.

Here are the masculine counterparts:

• מנומס = polite
• כועס = angry
• עצלן = lazy

And the feminine forms in the sentence are:

• מנומסת
• כועסת
• עצלנית

So Hebrew adjectives and many participle-like forms must agree with the gender and number of the noun or pronoun they describe.

It is best understood as a present participle form that often functions like an adjective.

In everyday Hebrew, forms like כועס / כועסת can behave a lot like English angry or being angry depending on context.

In this sentence:

אפילו כשהיא כועסת
the most natural translation is
even when she is angry.

So for a learner, it is very useful to recognize that many Hebrew present-tense verb forms can also feel adjective-like.

כשהיא is made of two parts:

• כש־ = when
• היא = she

So:

כשהיא = when she

Hebrew often attaches short function words like ש־, כ־, ל־, ב־, and ו־ directly to the following word.

A more formal alternative would be:

כאשר היא

But כשהיא is very common and natural.

Hebrew can show possession by adding a suffix directly to the noun.

• אחות = sister
• אחותה = her sister

The ending ־ה here means her.

Some related examples:

• אחותי = my sister
• אחותו = his sister
• אחותם = their sister

So instead of saying something separate like sister of her, Hebrew often just adds the possessive ending.

שהיא is also made of two parts:

• ש־ = that
• היא = she

So:

אומרת שהיא לא עצלנית בכלל
= says that she is not lazy at all

The ש־ is extremely common in Hebrew and introduces subordinate clauses, much like English that.

For example:

• אני חושב ש... = I think that...
• היא אומרת ש... = she says that...

Grammatically, it can be ambiguous.

In:

אבל אחותה אומרת שהיא לא עצלנית בכלל

the she after אומרת could refer to:

• the original woman
• or, less clearly, the sister herself

Usually, context tells you who is meant.

If you want to make it clearer, Hebrew can be more explicit. For example:

• אבל אחותה אומרת עליה שהיא לא עצלנית בכלל
  = but her sister says about her that she is not lazy at all

• אבל אחותה אומרת שהיא עצמה לא עצלנית בכלל
  = but her sister says that she herself is not lazy at all

So yes, this is a real ambiguity, and native speakers rely on context too.

In this sentence, בכלל strengthens the negative and means:

at all

So:

היא לא עצלנית בכלל
= she is not lazy at all

This is a very common pattern:

• לא ... בכלל = not ... at all

Examples:

• אני לא עייף בכלל = I’m not tired at all
• זה לא קשה בכלל = It’s not difficult at all

In other contexts, בכלל can also mean things like generally, in general, or even have a colloquial sense like actually / anyway, so its meaning depends a lot on context.

Because לא is the normal, everyday way to negate this kind of sentence.

So:

היא לא עצלנית
= she is not lazy

You may also see:

היא אינה עצלנית

This is also correct, but it is usually more formal, more written, or more elevated in tone.

For most everyday spoken Hebrew, לא is the form learners will hear and use most often.

Yes, the word order is natural.

Here is how the sentence is structured:

• היא תמיד מנומסת = She is always polite
• אפילו כשהיא כועסת = even when she is angry
• אבל אחותה אומרת... = but her sister says...
• לא עצלנית בכלל = not lazy at all

Some movement is possible in Hebrew, but not every change sounds equally natural.

For example:

• תמיד often appears before the adjective or predicate:
  היא תמיד מנומסת

• בכלל often comes near the end in negative sentences:
  היא לא עצלנית בכלל

So while Hebrew word order is somewhat flexible, the sentence as given sounds smooth and idiomatic.

Not exactly.

• מנומסת behaves like an adjective meaning polite
• עצלנית is an adjective meaning lazy
• כועסת comes from a participle form and can function in an adjective-like way

For a learner, the important point is this: in real Hebrew, these forms are often used in very similar ways after a subject, especially in present-tense descriptions.

So even if their grammar is not identical deep down, they all work here as words that describe she.