adjective. Not able to be relied on as honest or truthful.

Is there such a word as untrustworthiness?

Untrustworthiness is part of a person's character--something that cannot be addressed by expressions of contrition or policy reforms. Dictionary browser ?

What does untrustworthiness mean?

: not dependable or worthy of confidence : not trustworthy an untrustworthy person an untrustworthy source.