artlessness

noun

freedom from artificiality, frank simplicity, guilelessness

Wiktionary

noun

Etymology: Etymology tree English artless 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 artlessness From artless + -ness.

the state or quality of being artless
the state or quality of being innocent; naïveté