guilelessness — free from guile; sincere; honest; straightforward; frank.
naturalness — existing in or formed by nature (opposed to artificial): a natural bridge.
ingenuousness — free from reserve, restraint, or dissimulation; candid; sincere.
unaffected — not affected, acted upon, or influenced; unchanged; unaltered: The laboratory clock remained accurate, unaffected by the explosion.
innocence — the quality or state of being innocent; freedom from sin or moral wrong.
genuineness — possessing the claimed or attributed character, quality, or origin; not counterfeit; authentic; real: genuine sympathy; a genuine antique.