Dictionary definition · thin
verb
- lose thickness; become thin or thinner
- make thin or thinner"Thin the solution"
- lessen the strength or flavor of a solution or mixture"cut bourbon"
- take off weight
adjective
- of relatively small extent from one surface to the opposite or in cross section"thin wire"
- lacking excess flesh"you can't be too rich or too thin"
- very narrow"a thin line across the page"
- not dense"a thin beard"
- relatively thin in consistency or low in density; not viscous"air is thin at high altitudes"
- (of sound) lacking resonance or volume"a thin feeble cry"
- lacking spirit or sincere effort"a thin smile"
adverb
- without viscosity"the blood was flowing thin"
Source: Open English WordNet (CC BY 4.0).