also: すじのよい
expression, i-adjective (yoi/ii class)
having an aptitude (for); having a talent (for)
Describes someone who shows natural ability or promise, often in a specific field. Commonly used in phrases like 筋の良い選手 (a promising athlete) or 筋の良い質問 (a sharp question).
彼は筋の良い若手研究者だ。
He is a promising young researcher.
あのピッチャーは筋の良いボールを投げる。
That pitcher throws a ball with good movement.