time-serving noun 2adjective 1forms 2 noun2 •Opportunism. •The functionality of a timeserver. adjective1 •Opportunistic; conforming to the status quo in order to serve one's own interests.Harding brought with him a timeserving pal from The Times called Keith Blackmore, who was equally a stranger to broadcasting. — 2016 formsmore time-serving · most time-serving