Enormous, a.
Etymology: [L. enormis enormous, out of rule; e out + norma rule: cf. F. énorme. See Normal.]
1. Exceeding the usual rule, norm, or measure; out of due proportion; inordinate; abnormal. "Enormous bliss." Milton. "This enormous state." Shak. "The hoop's enormous size." Jenyns. Wallowing unwieldy, enormous in their gait. Milton.
2. Exceedingly wicked; outrageous; atrocious; monstrous; as, an enormous crime. That detestable profession of a life so enormous. Bale.
Syn. -- Huge; vast; immoderate; immense; excessive; prodigious; monstrous. -- Enormous, Immense, Excessive. We speak of a thing as enormous when it overpasses its ordinary law of existence or far exceeds its proper average or standard, and becomes -- so to speak -- abnormal in its magnitude, degree, etc.; as, a man of enormous strength; a deed of enormous wickedness. Immense expresses somewhat indefinitely an immeasurable quantity or extent. Excessive is applied to what is beyond a just measure or amount, and is always used in an evil; as, enormous size; an enormous crime; an immense expenditure; the expanse of ocean is immense. "Excessive levity and indulgence are ultimately excessive rigor." V. Knox. "Complaisance becomes servitude when it is excessive." La Rochefoucauld (Trans).
Shades of meaning
Fernald has no entry of its own for enormous; he lists it under large.
He lists it without comment; the entries above explain its neighbors.