Ditzy

Mary is rather ditzy.

The guy tossed some cash on the counter, then left with the ditzy girl and Abigail's fan.

[…] —and she'd smile like a primly mischievous Japanese girl, or like some slyly ditzy ingenue on a talk show, all the while watching her interrogator try to fathom (though sometimes they were pretty dim and just said, “Oh”) the surprising cleverness of her answer.

After hiring a crew of young guys and gals including loyal Jo, unlucky-in-love Frankie, strapping Bob, wisecracking Dee Dee, ditzy blonde Jonesy and titian-haired Penny, the gang drives up to the lodge.