From Latin subserviens, present active of subservio (“to serve under”).

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subservient (comparative more subservient, superlative most subservient)

1. Useful in an inferior capacity.
2. Obsequiously submissive.
   • 2019 May 19, Alex McLevy, “The final Game Of Thrones brings a pensive but simple meditation about stories (newbies)”, in The A.V. Club‎^[1], archived from the original on 22 May 2019:

     Sansa takes her place as ruler of the North, a free and independent land no longer subservient to anywhere else. And Arya does what she’s always done best: Make her own way, literally leaving everything she knows behind to see what’s over the next horizon.

• obedient
• subordinate

subservient

1. third-person plural future active indicative of subserviō