IMPLICITNESS • DICTIONARY ONE.COM • Definition of Implicitness

... to etymology, which would frequently mislead us, but from custom, the only infallible guide in this matter, that the meanings of words in present use must be learnt."—Philosophy of Rhetoric, p. 188. Jamieson too, with an implicitness little to be commended, takes this passage from Campbell; and, with no other change than that of "learnt" to "learned" publishes it as a corollary of his own.—Grammar of Rhetoric, p. 42. It is folly to state for truth what is so obviously wrong. Etymology and custom are ...

— The Grammar of English Grammars • Goold Brown