Read the dictionary definition of thin. All definitions for this word.
1. take off weight
2. lessen the strength or flavor of a solution or mixture
1. cut bourbon
3. make thin or thinner
1. Thin the solution
4. lose thickness; become thin or thinner
5. not dense
1. a thin beard
2. trees were sparse
6. lacking excess flesh
1. you can't be too rich or too thin
2. Yon Cassius has a lean and hungry look
7. (of sound) lacking resonance or volume
1. a thin feeble cry
8. lacking substance or significance
1. slight evidence
2. a tenuous argument
3. a thin plot
4. a fragile claim to fame
9. lacking spirit or sincere effort
1. a thin smile
10. of relatively small extent from one surface to the opposite or in cross section
1. thin wire
2. a thin chiffon blouse
3. a thin book
4. a thin layer of paint
11. relatively thin in consistency or low in density; not viscous
1. air is thin at high altitudes
2. a thin soup
3. skimmed milk is much thinner than whole milk
4. thin oil
12. very narrow
1. a thin line across the page
13. without viscosity
1. the blood was flowing thin