credibleness

Worthy of belief

The quality of being believable or worthy of trust.

Credibleness is a rarely used alternative to credibility: The witness's credibleness was called into question.

Most writers prefer credibility, which sounds more natural in contemporary English.

soundness

validity

Quality of being sound

corroboration · justification · rationale · logic · coherence · consistency · foundation · grounds · basis · defensibility

trustworthiness

integrity

Moral soundness and consistency

truthfulness · reliability · uprightness · conscientiousness · steadfastness · responsibility · honor · probity · reputation · character

believability

convincing

Able to persuade

imaginable · tenable · acceptable · reasonable · logical · coherent · compelling · believable · probable · likely

authenticity

genuine

Truly what it claims

certified · documented · verifiable · authoritative · sourced · substantiated · corroborated · validated · confirmed · attested

Opposites
believability

crediblenessincredibility

Quality beyond belief

unbelievability · implausibility · dubiousness · unbelievableness · improbability

Family

credit, incredible, creed, credible, credibility, discredit, incredibly, credence, incredulous

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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G