at or to a considerable extent downward; well within or beneath a surface.
to a thorough extent or profound degree: deeply pained; deeply committed.
with depth of color, tone, sound, etc.
with great cunning, skill, and subtlety.

before 900; Middle English deply, Old English dēoplīce, derivative of dēoplīc (adj.), equivalent to dēop deep + -līc(e) -ly

2. greatly, thoroughly, intensely, acutely. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deep (diːp)
adj (foll by in)
1.  extending or situated relatively far down from a surface: a deep pool
2.  extending or situated relatively far inwards, backwards, or sideways: a deep border of trees
3.  cricket relatively far from the pitch: the deep field; deep third man
4.  a.  (postpositive) of a specified dimension downwards, inwards, or backwards: six feet deep
 b.  (in combination): a six-foot-deep trench
5.  coming from or penetrating to a great depth: a deep breath
6.  difficult to understand or penetrate; abstruse
7.  learned or intellectually demanding: a deep discussion
8.  of great intensity; extreme: deep happiness; deep trouble
9.  absorbed or enveloped (by); engrossed or immersed (in): deep in study; deep in debt
10.  very cunning or crafty; devious: a deep plot
11.  mysterious or obscure: a deep secret
12.  (of a colour) having an intense or dark hue
13.  low in pitch or tone: a deep voice
14.  informal go off the deep end
 a.  to lose one's temper; react angrily
 b.  chiefly (US) to act rashly
15.  in deep water in a tricky position or in trouble
16.  throw someone in at the deep end See end
17.  any deep place on land or under water, esp below 6000 metres (3000 fathoms)
18.  the deep
 a.  a poetic term for the ocean
 b.  cricket the area of the field relatively far from the pitch
19.  the most profound, intense, or central part: the deep of winter
20.  a vast extent, as of space or time
21.  nautical one of the intervals on a sounding lead, one fathom apart
22.  far on in time; late: they worked deep into the night
23.  profoundly or intensely
24.  informal deep down in reality, esp as opposed to appearance: she is a very kind person deep down
25.  deep in the past long ago
[Old English dēop; related to Old High German tiof deep, Old Norse djupr]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. deoplice (see deep), used in both literal and figurative senses.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Some voters were deeply conflicted on which way to turn after two solid years
  of campaigning.
Plant in full sun, and water deeply only occasionally once established.
After true leaves appear, water plants deeply once a week.
Water plants deeply and regularly for the first two years.
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