
unfreiwillig
involuntary
Happening against one's own will or without one's own intention.
Er legte eine unfreiwillige Pause ein, weil der Zug Verspätung hatte.
He took an involuntary break because the train was delayed.
involuntary / unintentional
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involuntary
Happening against one's own will or without one's own intention.
Er legte eine unfreiwillige Pause ein, weil der Zug Verspätung hatte.
He took an involuntary break because the train was delayed.

unintentional
Happening unintentionally and often in a funny or embarrassing way.
Durch seinen Versprecher sorgte der Redner für unfreiwillige Komik im Publikum.
Through his slip of the tongue, the speaker created unintentional comedy among the audience.
The word is structured simply: it is the negation of 'freiwillig' (voluntary). The prefix 'un-' reverses the meaning of 'aus eigenem Willen' (of one's own free will).
Er musste eine unfreiwillige Überstunde machen.
He had to work an involuntary hour of overtime.
'Unfreiwillig' (involuntary/unintentional) can be used as an adjective before a noun or as an adverb that describes the manner of an action.
Der Streik führte zu einer unfreiwilligen Arbeitspause. (Adjektiv)
The strike led to an involuntary work break. (Adjective)
In the meaning of 'unintentionally funny', the word is very often used in the fixed expression 'unfreiwillige Komik' (unintentional comedy). This combination describes a situation that is funny without that being intended.
Der Politiker sorgte mit seinem Fehler für unfreiwillige Komik.
The politician's mistake created unintentional comedy.
reluctant
Unfreiwillig and widerwillig both show that something is not in accordance with one's wishes. Unfreiwillig means that the person has no free choice. Widerwillig means that the person consciously performs the action but feels inner resistance while doing so.

Wegen des ausgefallenen Zuges blieb er unfreiwillig länger im Büro.
Because his train was canceled, he involuntarily stayed at the office longer.
Auf die Bitte seines Chefs blieb er widerwillig länger im Büro.
At his boss's request, he reluctantly stayed at the office longer.