profound

adj

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

   “A gulf profound as that Serbonian bog”

2. Very deep; very serious.
3. 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”

   “profound wisdom”

   “Where no motives of interest or pride intervene, none can equal them for profound and philosophical views of society, ….”

   “The most superficial phenomena are sometimes the most profound. Let us begin our analysis of [bourgeois] society … with the appearance of the clothes its members wore ….”

4. 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.”

   “It’s probably one of the reasons the Shamima Begum case is having such a profound impact; one-dimensional stereotypes about Muslim women already run so deep.”

   “I visited the wreckage at Ladbroke Grove, Hatfield. Potters Bar and Heck, and the experiences had a profound effect on me - especially Ladbroke Grove.”

5. 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!”

noun

1. (obsolete, uncountable)The deep; the sea; the ocean.

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

2. (obsolete, uncountable)An abyss.

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

verb

1. (obsolete)To cause to sink deeply; to cause to dive or penetrate far down.
2. (obsolete)To dive deeply; to penetrate.

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