
eifrig
eager
Being involved in something with great diligence, commitment, and enthusiasm.
Die Studenten machten sich eifrig Notizen während des Vortrags.
The students eagerly took notes during the lecture.
eager / diligent
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eager
Being involved in something with great diligence, commitment, and enthusiasm.
Die Studenten machten sich eifrig Notizen während des Vortrags.
The students eagerly took notes during the lecture.
The adjective 'eifrig' (eager/diligent) belongs to the noun 'der Eifer' (zeal), which means 'großer Fleiß' (great diligence) or 'Begeisterung' (enthusiasm). So someone who is 'eifrig' shows a lot of 'Eifer'.
Mit großem Eifer begann sie, die neue Sprache zu lernen.
With great enthusiasm, she began learning the new language.
'Eifrig' (eagerly/diligently) is very often used as an adverb to describe the manner of an action. It then usually comes directly after the conjugated verb.
Die Kinder bastelten eifrig an ihren Geschenken.
The children eagerly worked on their gifts.
The word often describes activities that require concentration and diligence. Typical verbs are 'eifrig lernen' (to study eagerly), 'eifrig arbeiten' (to work diligently), 'eifrig lesen' (to read eagerly), or 'eifrig nicken' (to nod eagerly).
Er ist ein eifriger Schüler und macht immer seine Hausaufgaben.
He is a diligent student and always does his homework.
hardworking
Fleißig and eifrig both describe intense effort when studying or working. Fleißig mainly emphasizes sustained work performance. Eifrig places greater emphasis on strong commitment and enthusiasm for the activity in question.

Voller Begeisterung lernt Lena eifrig für die Abschlussprüfung.
Full of enthusiasm, Lena is studying eagerly for her final exam.
Lena lernt seit Wochen fleißig für die Abschlussprüfung.
Lena has been studying hard for her final exam for weeks.