All 4 Uses

profound
in
The Birthmark
(Auto-generated)

loved him more profoundly than ever
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profoundly = intensely
Yet, had Alymer reached a profounder wisdom, he need not thus have flung away the happiness which...
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profounder = deeper
Seated calmly in this laboratory, the pale philosopher had investigated the secrets of the highest cloud region and of the profoundest mines; he had satisfied himself of the causes that kindled and kept alive the fires of the volcano; and had explained the mystery of fountains, and how it is that they gush forth, some so bright and pure, and others with such rich medicinal virtues, from the dark bosom of the earth.†
In order to soothe Georgiana, and, as it were, to release her mind from the burden of actual things, Aylmer now put in practice some of the light and playful secrets which science had taught him among its profounder lore.†

Definitions:

(1) (profound as in: profound idea)
deep or far-reaching in intellect or consequence
(2) (profound as in: profound sadness)
of greatest intensity or emotional depth
(3) (meaning too rare to warrant focus)