candidness

noun

frankness/straightforwardness/sincerity in speech

Wiktionary

noun

Etymology: Etymology tree English candid Proto-Germanic *-inōną Proto-Indo-European *-dyé- Proto-Germanic *-atjaną Proto-Indo-European *-tus Proto-Germanic *-þuz Proto-Germanic *-assuz Proto-Germanic *-inassuz Proto-West Germanic *-nassī Old English -nes Middle English -nesse English -ness English candidness From candid + -ness.

The quality of being candid.
“This is an important factor in establishing trust and may affect the adolescent's candidness and anxiety level during the session.”