What does the word thick mean?

Usage examples for thick

  1. Then the darkness, very thick and black, swallowed everything again. – Howard Pyle's Book of Pirates by Howard I. Pyle
  2. You two are gittin' mighty thick over there. – His Own People by Booth Tarkington
  3. And thick, is it? – The Seiners by James B. (James Brendan) Connolly