Definitions from oxfordlearnersdictionaries.com
For hair/fur/trees = growing closely together in large numbers
“His eyebrows were thick and bushy.”
For hair = not growing closely together or in large amounts
“As Kyle got older his hair got thinner.”
For liquid = not flowing very easily
For liquid = containing more liquid than is normal or expected
“This pasta sauce is very thin, it doesn’t have much flavor.”
For fog/smoke/air = difficult to see through; difficult to breathe in
“The plane crashed in thick fog.”
For the air = containing less oxygen than normal
“The air is thin at high altitude.”
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