Extending far down from the top, or surface, to the bottom, literally or figuratively.
In a (specified) number of rows or layers.
Positioned or reaching far, especially down through something or into something.
Voluminous.
Far in extent in another (non-downwards, but generally also non-upwards) direction away from a point of reference.
Low in pitch.
Far from the center of the playing area, near to the boundary of the playing area, either in absolute terms or relative to a point of reference.
Distant in the past, ancient.
Significant, not superficial, in extent.
Muddy; boggy; sandy; said of roads.
Penetrating a long way, especially a long way forward.
Hard to penetrate or comprehend; profound; intricate; obscure.
Positioned back, or downfield, towards one's own goal, or towards or behind one's baseline or similar reference point.
Thick.
Profound, having great meaning or import, but possibly obscure or not obvious.
Extending to a level or length equivalent to the stated thing.
Highly saturated; rich.
Sound, heavy (describing a state of sleep from which one is not easily awoken).
Of penetrating or far-reaching intellect; not superficial; thoroughly skilled; sagacious; cunning.
In a profound, not superficial, manner.
In large volume.
Back towards one's own goal, baseline, or similar.
Far, especially far down through something or into something, physically or figuratively.
A deep hole or pit, a water well; an abyss.
A deep shade of colour.
A silent time; quiet isolation.
The deep part of a lake, sea, etc.
The profound part of a problem.
A fielding position near the boundary.
The sea, the ocean.
Able to be submerged.
A small nonmilitary, non-nuclear submarine for exploration.
A term used primarily by some navies for nuclear submarines, termed "true submersibles", because they cannot retroactively declare that their non-nuclear submarines should be called by a different name.
A very small "baby" submarine designed for specific localized missions, usually while tethered to a submarine or ship for life support and communications. Slang synonyms: midget-submarine, anchor.
A retroactive term used for non-nuclear submarines; nuclear submarines are termed "true submarines".