This definition which does not bear specifically on etymology considered that "quick" arose from "idle, lazy" through antiphrasis. This is equivalent to saying that ἀργός2 "idle" is the etymon of ἀργός1 "quick", although the lexicographer does not understand it that way because for him it is one and the same word. The Pseudo-Zonaras repeats the same explanation but adds an etymon which has nothing to do and is the usual etymon for "quick" (see ἀργός1 / ἀρκέω), coming from another source: the compiler does not seem to have notice that there was a contradiction between the two.