悔しい
くやしい · kuyashii · JLPT N3 · i-adj
mortifying
悔 = heart 忄 + every 毎: a loss that stings your heart every time
Kuyashii is the sting of losing when you know you could have won: frustration aimed at yourself, not plain sadness. The same 悔 appears in 後悔 (kōkai, regret). Sound hook: koo-YA-shee, muttered through gritted teeth after a defeat.