hireling

noun

1. a person who works only for pay, especially in a menial or boring job, with little or no concern for the value of the work.

adjective

2. serving for pay only.
3. venal; mercenary.

noun

1. derogatory a person who works only for money, esp one paid to do something unpleasant

n.

“one who works for hire,” Old English hyrling; see hire + -ling. As an adjective by 1580s.