American Heritage Dictionary
(2)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Hmm. A dutiful, attentive yet passive audience that waits to be called on?
He is dutiful, which is good, but he is not exactly inspired, which is why I look forward to summer for him.— Chicken Blog

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a month.