thin

adjective (thinner, thinnest)

• 1having opposite surfaces or sides close together; of little thickness or depth:thin slices of bread
• (of a person) having little, or too little, flesh or fat on their body:she was painfully thin
• (of a garment or other knitted or woven item) made of light material for coolness or elegance.
• (of a garment) having had a considerable amount of fabric worn away.
• (of script or type) consisting of narrow lines:tall, thin lettering

• 2having few parts or members relative to the area covered or filled; sparse:a depressingly thin crowd his hair was going thin
• not dense:the thin cold air of the mountains
• containing much liquid and not much solid substance:thin soup
• Climbing denoting a route on which the holds are small or scarce.

• 3(of a sound) faint and high-pitched:a thin, reedy little voice
• (of a smile) weak and forced.
• too weak to justify a result or effect; inadequate:the evidence is rather thin

adverb

• with little thickness or depth:thin-sliced ham cut it as thin as possible

verb (thins, thinning, thinned)

• 1make or become less dense, crowded, or numerous: [with object]:the remorseless fire of archers thinned their ranks [no object]:the trees began to thin out (as adjective thinning)thinning hair
• [with object] remove some plants from (a row or area) to allow the others more room to grow:thin out overwintered rows of peas
• make or become weaker or more watery: [with object]:if the soup is too thick, add a little water to thin it down [no object]:the blood thins

• 2make or become smaller in width or thickness: [with object]:their effect in thinning the ozone layer is probably slowing the global warming trend [no object]:the trees have thinned and diminished in size

• 3 [with object] Golf hit (a ball) above its center.