The Collaborative International Dictionary of English v.0.48:
Acquiescent \Ac`qui*es"cent\, a. [L. acquiescens, -centis; p. pr.] Resting satisfied or submissive; disposed tacitly to submit; assentive; as, an acquiescent policy. [1913 Webster]WordNet (r) 3.0 (2006):
acquiescent adj 1: willing to carry out the orders or wishes of another without protest; "too acquiescent to challenge authority" [syn: acquiescent, biddable]