adj. 有义务的；责无旁贷的
n. 使负义务（obligate的过去式）

[ adj ]
caused by law or conscience to follow a certain course
<adj.all>
felt obligated to repay the kindnesswas obligated to pay off the student loan

Obligate \Ob"li*gate\, v. t. [imp. & p. p. {Obligated}; p. pr. &
vb. n. {Obligating}.] [L. obligatus, p. p. of obligare. See
{Oblige}.]
1. To bring or place under obligation, moral or legal; to
hold by a constraining motive. ``Obligated by a sense of
duty.'' --Proudfit.

That's your true plan -- to obligate
The present ministers of state. --Churchill.

2. To bind or firmly hold to an act; to compel; to constrain;
to bind to any act of duty or courtesy by a formal pledge.

That they may not incline or be obligated to any
vile or lowly occupations. --Landor.

obligated \obligated\ adj.
1. under a moral obligation to someone.

Syn: beholden(predicate).
[WordNet 1.5]

2. under a legal obligation to someone.

Syn: indebted.
[WordNet 1.5]

3. owing gratitude or recognition to another for help or
favors etc. Opposite of {unobligated}. [Narrower terms:
{supposed(predicate), required ]

Syn: indebted.
[WordNet 1.5]