with opposite surfaces or sides that are close or relatively close together

thin slices of bread

a thin line of paint

having little, or too little, flesh or fat on the body

a thin, gawky adolescent

having few parts or members relative to the area covered or filled; sparse

a depressingly thin crowd

his hair was going thin

(of a liquid substance) not containing much solid; flowing freely

thin soup

lacking substance or quality; weak or inadequate

the evidence is rather thin

with little thickness or depth

cut the ham as thin as possible

a thin-sliced loaf

make or become less dense, crowded, or numerous

the remorseless fire of archers thinned their ranks

the trees began to thin out

make or become smaller in thickness

their effect in thinning the ozone layer is probably slowing the global warming trend

hit (a ball) above its centre