Borrowed from Middle Low German smuk (“supple, bendsome, pleasing, beautiful, petite, cute”) (compare Middle Low German smuk (“ornament, jewellery”)), from Old Saxon *smuk, *smukk, from Proto-Germanic *smukkaz (“flexible, bendsome, easy”).

Borrowed from German Low German smuk, related to schmücken (“to decorate”); see there for more. Somewhat displaced Zier (“ornament”).