形容詞 coy:

1. affectedly modest or shy especially in a playful or provocative way
   同義詞：demure, overmodest
2. showing marked and often playful or irritating evasiveness or reluctance to make a definite or committing statement
3. modestly or warily rejecting approaches or overtures

1. He is a bit coy when ask about the source of his income.
   問起他收入的來源，他就有些吞吞吐吐。
2. Please don't be so coy.
   請(qǐng)不要那么靦腆。
3. She gave a coy smile when he paid her a compliment.
   他恭維她時(shí)，她忸怩作態(tài)地笑了笑。

coy

adj.（形容詞）
coy.er,coy.est
Tending to avoid people and social situations; reserved.
怕羞的：傾向于逃避公眾和社交場(chǎng)合的；保守的
Affectedly and usually flirtatiously shy or modest.See Synonyms at shy
諂媚地,謙虛的：故作且經(jīng)常是諂媚地害羞或謙虛的參見 shy
Annoyingly unwilling to make a commitment.
忸怩：因不高興而不愿作出承諾的

來源：
Middle English
中古英語
from Old French quei, coi [quiet, still]
源自 古法語 quei, coi [寧靜的，平靜的]
from Vulgar Latin *quôtus
源自 俗拉丁語 *quôtus
from Latin quiôtus * see k wei…-
源自 拉丁語 quiôtus *參見 k wei…-

【引伸】
coy.ly
adv.（副詞）
coy.ness
n.（名詞）