toevalligerwijze (bw):
apropos(en) without looking for something/somebody., im Übrigen(en) without looking for something/somebody., nebenbei(en) without looking for something/somebody., nebenbei gesagt(en) without looking for something/somebody., zufällig(en) without looking for something/somebody., zufälligerweise(en) without looking for something/somebody., übrigens(en) without looking for something/somebody.
Via: Dbnary en WikiWoordenboeken
Via: Memodata.com