profound

Descending far below the surface; opening or reaching to great depth; deep.

A gulf profound as that Serbonian bog

Very deep; very serious.

Intellectually deep; entering far into subjects; reaching to the bottom of a matter, or of a branch of learning; thorough.

a profound investigation

a profound scholar

Characterized by intensity; deeply felt; pervading.

How now! which of your hips has the most profound sciatica?

Of the profound corruption of this class there can be no doubt.

Bending low, exhibiting or expressing deep humility; lowly; submissive.

And with this, and a profound bow to his patrons, the Manager retires, and the curtain rises.

What humble gestures! What profound reverence!

The deep; the sea; the ocean.

God, in the fathomlesse profound / Hath all his choice Commanders drown'd.

An abyss.

[…]if some other place, / From your dominion won, th' Ethereal King / Possesses lately, thither to arrive / travel this profound. Direct my course[…]

To cause to sink deeply; to cause to dive or penetrate far down.

To dive deeply; to penetrate.

But no man is likely to profound tbe Ocean of that Doctrine