盗人根性ぬすっとこんじょう

also: ぬすびとこんじょう

Meanings

1

thievish nature; cunning and greedy character

yojijukugo (four-character idiom)

A yojijukugo describing a person's inherent dishonesty, slyness, and greed, often used in a critical or moralistic tone.

あの男おとこの盗人ぬすっと根こん性じょうには呆あきれてしまう。
I'm disgusted by that man's thievish nature.
盗人ぬすっと根こん性じょうが染しみついているから、何なん度ど注ちゅう意いしても直なおらない。
His cunning and greedy character is so ingrained that he never changes no matter how many times he's warned.