fallax
cavillation; petty criticism
obsolete
First, after the sum of my fourth book, collected as pleaseth you, at the first dash you begin with an untrue report, joined to a subtle deceit or fallax, saying that my chief purpose that evil men receive not the body and blood of Christ in the sacrament.
Where it comes from
Borrowed from Latin fallāx (“deceptive”).
Adapted from the Wiktionary entry fallax (CC BY-SA 4.0).