Inattention, n.
Etymology: [Pref. in- not + attention: cf. F. inattention.]
Want of attention, or failure to pay attention; disregard; heedlessness; neglect. Novel lays attract our ravished ears; But old, the mind inattention hears. Pope.
Syn. -- Inadvertence; heedlessness; negligence; carelessness; disregard; remissness; thoughtlessness; neglect. -- Inattention, Inadvertence. We miss seeing a thing through inadvertence when do not happen to look at it; through inattention when we give no heed to it, though directly before us. The latter is therefore the worse. Inadvertence may be an involuntary accident; inattention is culpable neglect. A versatile mind is often inadvertent; a careless or stupid one is inattentive.
Shades of meaning
Fernald has no entry of its own for inattention; he lists it under neglect.
He lists it without comment; the entries above explain its neighbors.