Regrettable
Unsatisfactory
noun, な adjective
いかん
悔しい (くやしい) Regrettable, Frustrating, Vexing, Disappointing
惜しい (おしい) Regrettable, Disappointing, Precious, Dear
遺憾 (いかん) Regrettable, Unsatisfactory
It's Regrettable that an eagle い can かん kill small pets.