depth:  Depth is not as old as it looks. Similar nouns, such as length and strength, existed in Old English, but depth, like breadth, is a much later creation. In Old English the nouns denoting ‘quality of being deep’ were dīepe and dēopnes ‘deepness’. => deep
late 14c., apparently formed in Middle English on model of length, breadth; from Old English deop "deep" (see deep) + -th (2). Replaced older deopnes "deepness." Though the English word is relatively recent, the formation is in Proto-Germanic, *deupitho-, and corresponds to Old Saxon diupitha, Dutch diepte, Old Norse dypð, Gothic diupiþa.
1. Mr Gibson is clearly intellectually out of his depth.
2. White wines tend to gain depth of colour with age.
3. The smaller lake ranges from five to fourteen feet in depth.
4. Both housings are waterproof to a depth of two metres.
5. The fat, broad tyres had a good depth of tread.