mercenary spirit; working only for money
A rare noun describing an attitude of working solely for financial gain, without dedication or passion. Likely to be found in older texts or discussions of work ethic.
I was disappointed by his mercenary attitude toward work.
Compound of 勤め (つとめ, 'work, service') and 気 (き, 'spirit, mood'). The exact historical derivation is uncertain; the word is rare in modern usage.