
einwandfrei
flawless
Without any defects, errors, or problems; in perfect condition.
Das Gerät funktioniert einwandfrei.
The device works flawlessly.
flawless
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flawless
Without any defects, errors, or problems; in perfect condition.
Das Gerät funktioniert einwandfrei.
The device works flawlessly.

impeccable
Not open to criticism in a moral or character-related sense; beyond any doubt.
Sein Verhalten in der Krise war absolut einwandfrei.
His behavior during the crisis was absolutely impeccable.
The word is made up of 'Einwand' (objection, point of criticism) and 'frei' (free). Something that is 'einwandfrei' (flawless) is therefore literally 'free of objections'.
Die Qualität der gelieferten Ware war einwandfrei.
The quality of the delivered goods was flawless.
'Einwandfrei' (flawlessly) is very often used as an adverb to describe that a process or function runs without problems. It then usually stands at the end of the sentence or directly after the verb.
Der Drucker funktioniert seit der Reparatur wieder einwandfrei.
The printer has been working flawlessly again since the repair.
In the meaning 'fehlerfrei' (error-free), 'einwandfrei' (flawless) often refers to the condition or function of devices, machines, or products. Typical nouns are 'Zustand' (condition), 'Funktion' (function), or 'Qualität' (quality).
Das Auto ist in einem einwandfreien technischen Zustand.
The car is in flawless technical condition.
When referring to character or behavior, 'einwandfrei' (impeccable) is used to express that a person or their actions cannot be criticized morally. Typical nouns are 'Verhalten' (behavior), 'Charakter' (character), or 'Ruf' (reputation).
Der Politiker hat einen einwandfreien Ruf.
The politician has an impeccable reputation.
perfect
Einwandfrei means that something has no detectable errors, defects, or problems. Perfekt can also express freedom from errors, but it assesses this more comprehensively, as complete or exactly right. Something can therefore function flawlessly without being perfect for every purpose.

Nach der Reparatur läuft die Maschine einwandfrei und zeigt keine Störungen mehr.
After the repair, the machine is working flawlessly and no longer has any malfunctions.
Nach der Reparatur läuft die Maschine perfekt und erfüllt alle unsere Anforderungen.
After the repair, the machine is working perfectly and meets all our requirements.