IPA: /ˈkrɛdɪbli/
KK: /ˈkrɛdɪbli/
In a way that is believable or convincing.
The witness spoke credibly during the trial, which helped the jury trust her testimony.
Credibly → It is formed from "cred" (from Latin "credere", meaning to believe) and "-ibly" (a suffix forming adverbs meaning capable of being). The word "credibly" means in a manner that is capable of being believed or trustworthy.
Think of 'cred' meaning to believe, and remember that 'credibly' describes something that can be believed or is trustworthy.