“Then she looked at Chase and winked, with a meaning nod at the unobserving Deppingham.”

“It was full of heartbreak, and Katy was too unobserving to notice how round and steady and commercial the penmanship was, and how large and fine were the flourishes.”

“Was he really so unobservant that he had not heard the barbed criticism behind that woman's comment?”

“You'd have to be very unobservant not to have noticed that there are an awful lot of bloggers with an avowedly libertarian political philosophy.”

“If she loved to talk, Mercedes was not unobservant, especially when she was observing these two.”