根こん性じょうなし

noun, na-adjective

coward; gutless person; weakling

A derogatory term for someone lacking guts, spirit, or perseverance. Often used as an insult.

• あいつは根こん性じょうなしだから、すぐ諦あきらめる。

  That guy is a gutless coward, so he gives up right away.

• そんな根こん性じょうなしのやり方かたじゃ成せい功こうできないよ。

  You can't succeed with such a spineless approach.