What does "profound" mean?

Profound: Intellectually deep; entering far into subjects; reaching to the bottom of a matter, or of a branch of learning; thorough; as, a profound investigation or treatise; a profound scholar; profound wisdom.

Additional senses

  1. 2.Characterized by intensity; deeply felt; pervading; overmastering; far-reaching; strongly impressed; as, a profound sleep. "Profound sciatica." Shak. Of the profound corruption of this class there can be no doubt. Milman.
  2. 3.Bending low, exhibiting or expressing deep humility; lowly; submissive; as, a profound bow. What humble gestures! What profound reverence! Dupp
  3. 4.The deep; the sea; the ocean. God in the fathomless profound Hath all this choice commanders drowned. Sandys.
  4. 5.An abyss. Milton.
  5. 6.To cause to sink deeply; to cause to dive or penetrate far down. [Obs.] Sir T. Browne.
  6. 7.To dive deeply; to penetrate. [Obs.]

Sources