i-adjective
having a small appetite; eating lightly
Describes someone who habitually eats little or has a naturally small appetite. Often used to express concern or as a gentle observation.
See also: 食が細い
彼女は食の細い人だから、いつも少ししか食べない。
She has a small appetite, so she always eats only a little.
My child is a light eater and often leaves school lunch unfinished.