Credibly means in a way that can be believed. Credibly reported.
In journalism it signals that the source is trusted without naming them. To act credibly means being believed rather than being right.
1adverbcrediblyIn a way that can be believed.
“The story was credibly sourced and turned out to be wrong.”
credibly is a manner.
Proto-Indo-European
*ḱerd-
Latin
crēdibilis — worthy of belief
Middle French
credible
Middle English
credible
English
credible
English, today
credibly
Built from
From credible + -ly. credible comes from Middle English credible, borrowed from Middle French credible, from Latin crēdibilis (“worthy of belief”), from crēdō (“believe”); see credit.
Etymology from Wiktionary, CC BY-SA