unintentional
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unintentional
Not happening on purpose; without it being intended. Synonyms are accidental or involuntary.
Es tut mir leid, das war ein unbeabsichtigter Fehler meinerseits.
I'm sorry, that was an unintentional mistake on my part.
The word consists of the prefix 'un-' and 'beabsichtigt' (intended). The prefix 'un-' means 'not'. 'Beabsichtigt' comes from the noun 'die Absicht' (intention), so something is 'unbeabsichtigt' (unintentional) when it happens without intention.
Seine Bemerkung war vielleicht unhöflich, aber sicher unbeabsichtigt.
His comment may have been rude, but it was certainly unintentional.
'Unbeabsichtigt' (unintentional) can stand as an adjective before a noun or as an adverb that describes a verb. As an adverb, it often comes after the verb.
Das war eine unbeabsichtigte Folge seiner Handlung.
That was an unintentional consequence of his action.
Common combinations are 'unbeabsichtigter Fehler' (unintentional mistake), 'unbeabsichtigte Nebenwirkung' (unintended side effect), or 'unbeabsichtigte Konsequenz' (unintended consequence). It often describes negative outcomes that were not intended.
Das Medikament hatte leider einige unbeabsichtigte Nebenwirkungen.
Unfortunately, the medication had some unintended side effects.
random / by chance
'zufällig' and 'unbeabsichtigt' can both say that something was not planned. 'zufällig' emphasizes chance more: something simply happens, without anyone expecting it. 'unbeabsichtigt' emphasizes more that something was not intended, often a result or an effect. When it is about a pure chance situation, 'zufällig' sounds more natural. When you want to say that a consequence was not intended, 'unbeabsichtigt' fits better.
Beim Arzt hat er unbeabsichtigt ein wichtiges Dokument liegen lassen.
At the doctor's office, he unintentionally left an important document behind.
Nach dem Gespräch trifft die Kundin zufällig ihren Nachbarn vor der Werkstatt.
After the conversation, the customer happens to meet her neighbor in front of the repair shop.