
zufrieden
satisfied
Describing the state in which you are happy with a situation, performance, or result and do not want any change.
Der Kunde war mit dem Service sehr zufrieden.
The customer was very satisfied with the service.
satisfied
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satisfied
Describing the state in which you are happy with a situation, performance, or result and do not want any change.
Der Kunde war mit dem Service sehr zufrieden.
The customer was very satisfied with the service.

to leave someone alone
A fixed expression meaning to leave someone in peace and not continue to disturb or bother them.
Jetzt lass mich endlich mit dem Thema zufrieden!
Now finally leave me alone about this topic!
The word is made up of 'zu' and 'Frieden' (peace). So someone who is zufrieden (satisfied) is literally 'at peace' with a situation.
Nach einem langen Arbeitstag war er einfach nur zufrieden, zu Hause zu sein.
After a long workday, he was simply satisfied to be at home.
The adjective 'zufrieden' (satisfied) is almost always used with the preposition 'mit' (with) and the dative to express what you are satisfied with.
Ich bin mit meiner neuen Wohnung sehr zufrieden.
I am very satisfied with my new apartment.
'Zufrieden' (satisfied) can also be used as an adverb to describe a verb. It then expresses that an action is carried out in a satisfied state.
Er lehnte sich zufrieden zurück und schloss die Augen.
He leaned back contentedly and closed his eyes.
The expression 'jemanden zufrieden lassen' (to leave someone alone) means to leave a person in peace. The person who is to be left in peace is in the accusative.
Er wollte über das Thema nicht mehr reden, also ließ ich ihn zufrieden.
He didn't want to talk about the topic anymore, so I left him alone.
happy / lucky
Both words can describe a positive reaction to a result. „Zufrieden“ evaluates a situation or performance as good enough and appropriate, while „glücklich“ expresses a stronger, more general feeling of happiness. „Zufrieden“ fits an objective evaluation, while „glücklich“ is more suitable for great personal joy.

Mit dem Ergebnis ihrer Prüfung ist sie sehr zufrieden.
She is very satisfied with the result of her exam.
Über das Ergebnis ihrer Prüfung ist sie sehr glücklich.
She is very happy about the result of her exam.