unassertive in English
One possible explanation would be that workers are not assigned to jobs randomly, but that managerial positions are given primarily to assertive people, whereas subordinate jobs are given primarily to unassertive people.
Use "unassertive" in a sentence
1. Amiables are people-oriented, relatively unassertive, warm, and reliable
2. Antonyms for Confrontational include nonConfrontational, nonaggressive, compromising, nonargumentative, nonbelligerent, unassertive, amenable, biddable, diplomatic
3. Synonyms for self-Abasing include submissive, compliant, yielding, malleable, acquiescent, accommodating, amenable, tractable, manageable and unassertive
4. Assertively: 1 adv in an assertive manner “`I will take care of my own life,' she said Assertively ” Antonyms: unAssertively in an unassertive manner
5. 29 But what if those "rules" have made you into a passive, unassertive, accommodating, compliant person when you would really prefer to speak up more about your true feelings and desires?