Significados de whimsical quirk en inglés

There was a whimsical quirk of his rather thin but gentle lips which reminded her of the big bust of Emerson in her father's study.

Now," Bud added sardonically, but with the whimsical quirk withal, "if it was like a carburetor, and you could give it a richer mixture-

"La, la," she said, with a whimsical quirk of the head, and no apparent relevancy:

"Well, that's somethin'," he said with the whimsical quirk to his mouth she knew of old.