ret·i·cent /-sənt/
(a.)無言的,沈默的,謹慎的
Ret·i·cent a. Inclined to keep silent; reserved; uncommunicative.
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reticent
adj 1: temperamentally disinclined to talk [syn: untalkative]
2: cool and formal in manner [syn: reserved, restrained, unemotional]
3: reluctant to draw attention to yourself [syn: self-effacing]