credibility, credibleness, believability

the quality of being believable or trustworthy

• authenticity, genuineness, legitimacy — undisputed credibility
• cogency, validity, rigor, rigour — the quality of being logically valid
• plausibility, plausibleness — apparent validity
• street credibility, street cred, cred — credibility among young fashionable urban individuals

• quality — an essential and distinguishing attribute of something or someone

• credible, believable — capable of being believed
• incredible, unbelievable — beyond belief or understanding