Innoxious, a.
Etymology: [L. innoxius. See In- not, and Noxious.]
1. Free from hurtful qualities or effects; harmless. "Innoxious flames." Sir K. Digby.
2. Free from crime; pure; innocent. Pope. -- In*nox`ious*ly, adv. -- In*nox"ious*ness, n.
Shades of meaning
Fernald has no entry of its own for innoxious; he lists it under innocent.
He lists it without comment; the entries above explain its neighbors.