Acquiescent

[ækwɪ'es(ə)nt] or [,ækwɪ'ɛsənt]

(adj.) willing to carry out the orders or wishes of another without protest; 'too acquiescent to challenge authority' .

Edited by Debra--From WordNet

(a.) Resting satisfied or submissive; disposed tacitly to submit; assentive; as, an acquiescent policy.

Checker: Vivian

a. Complying, yielding, submitting.

Typist: Shirley

This undeniable argument produced a sort of acquiescent umph! Walter Scott. Ivanhoe.
Andy shrugged his shoulders, and gave an acquiescent whistle. Harriet Beecher Stowe. Uncle Tom's Cabin.
Conversational and acquiescent on both sides. Charles Dickens. Bleak House.

Typist: Shirley