n. 无言, 沉默, 勉强

[ noun ]
the trait of being uncommunicative; not volunteering anything more than necessary
<noun.attribute>

Reticence \Ret"i*cence\, n. [L. reticentia: cf. F.
r['e]ticence.]
1. The quality or state of being reticent, or keeping
silence; the state of holding one's tonque; refraining to
speak of that which is suggested; uncommunicativeness.

Such fine reserve and noble reticence. --Tennyson.

2. (Rhet.) A figure by which a person really speaks of a
thing while he makes a show as if he would say nothingon
the subject.