American Heritage Dictionary
(4)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
And, perhaps, though the impertinence was almost unendurable, the idea conveyed was not altogether so grievous; it had certainly never hitherto occurred to her that she might become a second Mrs Stumfold; but, after all, why not?— Miss Mackenzie
Delightful impertinence, that is forward to oblige them Sidenote: THE LORD OF THE TIDES Brighton's decline as a fashionable resort came with the railway.— Highways ; Byways in Sussex
So for sixty long years I have had to face Mary Darragh and submit to her impertinence, and I tell you I am sick of it!— The Statesmen Snowbound
It's a perfect--impertinence in me, to ask, I know, but It is a fair question," I hastened to assure her; "one that any one might ask.— Branded
He checked the impertinence, and silenced the vanity of captious cavillers 17.— Modern Skepticism: A Journey Through the Land of Doubt and Back Again A Life Story

Century Dictionary (2)
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.
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