Attempts to resolve the Quandary:
5
Her mouth was a perfected lineament of sensuality until she opened it and spewed forth the most inane prattle of such inenarrable intellectual grotesqueries that I was driven to end our potential assignation with the construction of an outlandish prevarication about my fear of “soiling her reputation” in the eyes of the blue-nosed Grundyite’s from Tulsa; currently in-situ here at the Shag and Bang. (by gumo420)
4
A veritable Mrs. Grundy, the Cuttington's nanny, Gwendolyn, would scowl, her harsh lineaments rearranging themselves to express both annoyance and exasperation, whenever her young charges spun inane prevarications in response to her simple queries. (by luigi)
3
Our local librarian, by no means a Mrs. Grundy, bore that label because of her equine lineament and inane hairstyle, and subsequently whenever a patron might suggest as much she would prevaricate regarding her very modest unseen endowments to let it be known that she was, in fact, available to any card holder. (by tree)
2
As I gazed out my bedroom window into the treetops, I thought I detected in the leafy canopy the lineaments of faces, all pinched and disapproving, a regular posse of Mrs. Grundys, which reminded me painfully of the inane and shortsighted impulse that had prompted me to prevaricate so shamelessly to Mother about my part in undoing the ties of her wraparound skirt in the parking lot of Suburban Square. (by cusheamus)
1
Botoxed into petrifaction, the wedged phalanx of Mrs Grundys was powerless to readjust the lineaments of its aspect as Mr Darcy entered stage left, unbuttoned and implausibly erect, crying 'your inane prevarications are unendurable,' before relieving his ardour against a frottable satinwood card table. (by Bud Myte)

6
When we conceal our true lineaments, or prevaricate about our actual predilections, hoping to appease the inane prudery of a fictional Mrs. Grundy, we do not protect ourselves: we bring her to life. (by Rudi)