Die Frau wirkt schlank.

Here wirkt comes from the verb wirken. In this sentence, it means seems, appears, or comes across as.

So Die Frau wirkt schlank means that the woman seems slim or looks slim, not necessarily that the speaker is stating it as an absolute fact.

There is an important difference:

• Die Frau ist schlank. = The woman is slim.
• Die Frau wirkt schlank. = The woman seems / appears slim.

So ist states a fact more directly, while wirkt expresses an impression or appearance.

No. That is a very common confusion for English speakers.

• arbeiten = to work, as in having a job
• funktionieren = to work, as in a machine functioning
• wirken = to have an effect, to seem, to appear

So in this sentence, wirken definitely does not mean work. It means something like give the impression of being.

Frau is a feminine noun in German, so its basic singular article is die.

Here die Frau is also the subject of the sentence, so it is in the nominative case.

• die Frau = the woman

Because the subject is die Frau, which is third person singular (she).

The verb wirken is conjugated like this in the present tense:

• ich wirke
• du wirkst
• er/sie/es wirkt
• wir wirken
• ihr wirkt
• sie/Sie wirken

So with die Frau, you need wirkt.

Because schlank is not being used before a noun here. It is being used as a predicate adjective after the verb wirken.

Compare:

• eine schlanke Frau = a slim woman
  
  • Here the adjective comes before the noun, so it takes an ending: schlanke
• Die Frau wirkt schlank. = The woman seems slim.
  
  • Here the adjective comes after the verb, so it has no ending

This is similar to English: The woman is slim, not the woman is slimmy or anything like that.

It is still an adjective.

In Die Frau wirkt schlank, schlank describes the subject die Frau. It is not modifying the verb in the same way an adverb would. German simply uses the basic adjective form after verbs like:

• sein = to be
• werden = to become
• bleiben = to remain
• wirken = to seem/appear

So schlank is a predicate adjective.

Yes. That is a very natural alternative.

• Die Frau wirkt schlank. = The woman seems slim / gives the impression of being slim.
• Die Frau sieht schlank aus. = The woman looks slim.

The difference is small, but sieht ... aus often focuses more directly on visual appearance, while wirkt can sound a little broader or more interpretive.

It follows the normal German main-clause pattern: subject + verb + rest.

• Die Frau = subject
• wirkt = finite verb
• schlank = predicate adjective

German main clauses usually put the conjugated verb in second position, and that is exactly what happens here.

A rough English-friendly guide is veerkt, but with a short German i sound and a rolled or lightly pronounced r, depending on accent.

A few helpful points:

• w in German sounds like English v
• i in wirkt is short
• rk and kt create a fairly compact consonant cluster at the end

If it feels difficult at first, try building it step by step:

• wirk
• then add t → wirkt

By itself, it is usually fairly neutral. It simply describes an impression.

Still, because it comments on someone’s body or appearance, the tone depends a lot on context. In real life, sentences about someone looking schlank may sound complimentary, observational, or sometimes personal, depending on who is speaking and why.