Conversible

a. 1661, Henry Hammond, Sermon 7 in Sermons Preached by Henry Hammond, London: Robert Pawlet, 1675, p. 96, [It is] from the not exercising of faith actually, that I ever sin; and every man in the same degree, that he is a sinner, so far is he an unbeliever. So that this conversible retrogradous Sorites may shut up all.

“But what do you call right? What’s your canon of certainty there?” “The conscience that’s in us—that charming, conversible, infinite thing, the intensest thing we know. […]”

Reciprocal signs I call those that are conversible with the thing they are the signs of.

[These] were with me, terms full as conversible as —

Phillips is [...] a witty, conversible young man, easy to like.