A question deep almost as the mystery of life.
De Quincey.
O Lord, . . . thy thoughts are very deep.
Ps. xcii. 5.
5. Of penetrating or far-reaching intellect; not superficial; thoroughly skilled; sagacious; cunning.
Deep clerks she dumbs.
Shak.
6. Profound; thorough; complete; unmixed; intense; heavy; heartfelt; as, deep distress; deep melancholy; deep horror. "Deep despair." Milton. "Deep silence." Milton. "Deep sleep." Gen. ii. 21. "Deeper darkness." >Hoole. "Their deep poverty." 2 Cor. viii. 2.
An attitude of deep respect.
Motley.
7. Strongly colored; dark; intense; not light or thin; as, deep blue or crimson.
8. Of low tone; full-toned; not high or sharp; grave; heavy. "The deep thunder." Byron.
The bass of heaven's deep organ.
Milton.
9. Muddy; boggy; sandy; -- said of roads. Chaucer.
The ways in that vale were very deep.
Clarendon.
A deep line of operations (Military), a long line. -- Deep mourning (Costume), mourning complete and strongly marked, the garments being not only all black, but also composed of lusterless materials and of such fashion as is identified with mourning garments.
Deep, adv. To a great depth; with depth; far down; profoundly; deeply.
Deep-versed in books, and shallow in himself.
Milton.
Drink deep, or taste not the Pierian spring.
Pope.
Deep, in its usual adverbial senses, is often prefixed to an adjective; as, deep-chested, deep-cut, deep-seated, deep-toned, deep-voiced, "deep-uddered kine."
Deep, n. 1. That which is deep, especially deep water, as the sea or ocean; an abyss; a great depth.
Courage from the deeps of knowledge springs.
Cowley.
The hollow deep of hell resounded.
The Gutenberg Webster's Unabridged Dictionary: Section D and E · The Wunder Library — complete classics, free to read, with narration.