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Use "wittiness" in a sentence
"The book's wittiness is derived more from the incongruous circumstances than it is from one-liners (though there are those), and I'm undecided as to whether this is a lost opportunity (could it have been funnier?) or the reason why the humor succeeds (there are several laugh-out-loud moments)."
"Sadly, his "wittiness" will be available only in Birmingham."
"I do rather think you might need a touch more than just "wittiness" Ms Coren."