Innocuous, a.
Etymology: [L. innocuus; in- not + nocuus hurtful, fr. nocere to hurt. See Innocent.]
Harmless; producing no ill effect; innocent. A patient, innocuous, innocent man. Burton. -- In*noc"u*ous*ly, adv. -- In*noc"u*ous*ness, n. Where the salt sea innocuously breaks. Wordsworth.
Shades of meaning
Fernald has no entry of its own for innocuous; he lists it under innocent.
He lists it without comment; the entries above explain its neighbors.