At least one mod has cautioned us against using the "L" word in reference to blatant mendacity. I'm sure you can express yourself well enough without it.
I wouldn't count on help from authority on this topic.
Or know how to access Mr. Roget.
Here's a useful list for evos posting on these threads.
aspersion, backbiting, calumniation, calumny, complete distortion of the facts, corker, deceit, deception, defamation, detraction, dishonesty, disinformation, distortion, evasion, fable, fabrication, falsehood, falseness, falsification, falsity, fib, fiction, fish story, forgery, fraudulence, guile, hyperbole, inaccuracy, invention, libel, mendacity, misrepresentation, misstatement, myth, obloquy, perjury, prevarication, revilement, reviling, slander, subterfuge, tale, tall story, terminological inexactitude, vilification, white lie, whopper
Or if you need the verb:
be untruthful, beguile, break promise, bull, con, concoct, deceive, delude, dissemble, dissimulate, distort, dupe, equivocate, exaggerate, fabricate, fake, falsify, fib, forswear, frame, fudge, invent, jazz, jive, make believe, malign, misguide, misinform, misinstruct, mislead, misrepresent, misspeak, misstate, overdraw, palter, perjure, pervert, phony up, plant, prevaricate, promote, put on, queer, snow, soft-soap, string along, victimize
Maybe we can have DarwinCentral announce the 'synonym of the day' every morning?