根こんの良いい

expression, i-adjective (yoi/ii class)

enduring; persevering; tenacious

Describes a person who does not give up easily, showing patience and persistence over time. Often used in positive contexts to praise someone's steady character.

• 彼かれは根こんの良いい人ひとだから、きっと最さい後ごまでやり遂とげるよ。

  He's a persevering person, so I'm sure he'll see it through to the end.

• 根こんの良いい努ど力りょくが実みを結むすんだ。

  His tenacious efforts paid off.