What's the adjective for confessionaries? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs confess, fess and confesse which may be used as adjectives within certain contexts.
“It is failure filtered the Silicon Valley way – as something nearly admirable, certainly confessable, an improving experience that may be dissected plainly and in public.”
“Some of us were taught that anger was a confessable sin, and as one of the Seven Deadlies you really didn't want to die with this one on your soul.”
“The ratzinger is defined as the smallest confessable unit of actual sin.”