Synonym: astuteness, deepness, profoundness, profundity. Similar words: adept, inept, percept, accept, except, septic, keep to, deplete. Meaning: [depθ] 
n. 1. extent downward or backward or inward 2. degree of psychological or intellectual profundity 3. (usually plural) the deepest and most remote part 4. (usually plural) a low moral state 5. the intellectual ability to penetrate deeply into ideas.
n. 1. extent downward or backward or inward 2. degree of psychological or intellectual profundity 3. (usually plural) the deepest and most remote part 4. (usually plural) a low moral state 5. the intellectual ability to penetrate deeply into ideas. 
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1 Water was found at a depth of 30 metres.
2 Everything he writes demonstrates the depth of his sensibility.
3 Water was found at a depth of 30 ft.
4 Don't go out of your depth; you can't swim.
5 They dug down to a depth of two metres.
6 What's the depth of the water here?
7 It happened in the depth of winter.
8 Snow accumulated to a depth of five feet.
9 What is the depth of this lake?
10 Snow accumulated to a depth of 12 feet.
11 The cave descends to a depth of 340 feet.
12 Measure the depth of the cupboard/shelf.
13 What is the depth of the well?
14 The bathyscaphe has plumbed the depth of the Indian Ocean.
15 Younger students cannot be expected to have great depth of understanding.
16 I was out of my depth in the advanced class[sentencedict.com], so I moved to the intermediate class.
17 I studied phonology in depth at university.
18 I was impressed by the depth of her knowledge.
19 The depth of the shaft is 520 yards.
20 I haven't looked at the report in depth yet.
21 He spoke with great depth of feeling.
22 The accident precipitated them into the depth of adversity.
23 The subject was discussed in great depth .
24 At what depth does the wreck lie?
25 The whale dived to a depth of 300 meters.
26 Terry lacks depth - he's a very superficial person.
27 Mr Gibson is clearly intellectually out of his depth.
28 Ever has it been that love knows not its own depth until the hour of separation. Kahlil Gibran 
29 The oil well extended several hundreds of feet in depth.
30 The smaller lake ranges from five to fourteen feet in depth.