noun
mercenary spirit; greed; avarice; base nature
A derogatory term for a grasping, money-grubbing mentality; implies a shameless willingness to do anything for personal gain.
あの政治家の乞食根性には呆れる。
I'm disgusted by that politician's mercenary greed.
彼は金のためなら何でもする乞食根性の持ち主だ。
He has a base nature that will do anything for money.