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Middle French
Etymology
Borrowed from Medieval Latin mendāciōsus.
Adjective
mendacieux m (feminine singular mendacieuse, masculine plural mendacieux, feminine plural mendacieuses)
- false, especially in a way intending to deceive
1562, François Le Picart, Les Sermons et Iinstructions Chrestiennes pour tous les iours de l'Advent, iusquea a Noel, & de tous les Dimenches et Festes depuis Noel, iusques à Caresme.:La venue de l'Antechrist sera par conduicte du diable, il fera des miracles: mais ils seront mendacieux, car seulement seront apparents, pource qu'ils tendront à deception, & perdition.- The coming of the Antichrist will be by the conduct of the devil. He will do miracles, but they will be false, for the will be apparent, because they will tend towards deception and loss.