Immense, a.
Etymology: [L. immensus; pref. im- not + mensus, p. p. of metiri to measure: cf. F. immense. See Measure.]
Immeasurable; unlimited. In commonest use: Very great; vast; huge. "Immense the power" Pope. "Immense and boundless ocean." Daniel. O Goodness infinite! Goodness immense! Milton.
Syn. -- Infinite; immeasurable; illimitable; unbounded; unlimited; interminable; vast; prodigious; enormous; monstrous. See Enormous.
Shades of meaning
Fernald has no entry of its own for immense; he lists it under large.
He lists it without comment; the entries above explain its neighbors.