Subservient
adjective
abjectly submissive; characteristic of a slave or servant; ; - S.H.Adams
“slavish devotion to her job ruled her life”
Similar: slavish, submissive
adjective
compliant and obedient to authority; -G. B. Shaw
“editors and journalists who express opinions in print that are opposed to the interests of the rich are dismissed and replaced by subservient ones”
adjective
serving or acting as a means or aid
“instrumental in solving the crime”
Similar: implemental, instrumental