1.不白之冤：unrighted wrong; unredressed injustice
2.不败纪录：clean record, spotless record
3.不避艰险：shrink from no difficulty or danger; make light of difficulties and dangers
4.不辨菽麦：be unable to tell beans from wheat—have no knowledge of practical matters
5.不成体统：most improper, downright outrageous
6.不成文法：unwritten law, customary law, common law
7.不逞之徒：unruly person, desperado
8.不耻下问：not feel ashamed to seek advice from one’s subordinates
9.不出所料：as expected, as might have been expected
10.不揣冒昧：venture to,
11.不辞而别：run away (without other’s knowing)
12.不辞辛苦：spare no effort, take pains, take the trouble to
13.不打不成器：spare the rod and spoil the child
14.不打不成交：No discord, no concord.
15.不打自招：make a confession of one’s own accord; disclose unintentionally, give oneself away
16.不大不小：neither too big nor too small, just right
17.不当回事：not think sht. Important
18.不到长城非好汉：He who has never been to the Great Wall is not a true man.
19.不到黄河心不死：not stop until one reaches the Huang River—not stop until one reaches one’s goal
20.不得安宁：disturbing, on one’s back
21.不得而知：awkward, unhandy
22.不得人心：unpopular
23.不得要领：fail to grasp the main points, fail to get the nick of sth.
24.不凳大雅之堂：not appeal to refined tastes, be unpolished, be coarse and vulgar
25.不动生色：show no emotion
26.不二法门：one and only way, only proper course
27.不费吹灰之力：as easy as blowing off dust, as easy as failing off a log
28.不分彼此：make no distinction between one’s own and sb. Else’s, share everything
29.不分敌我：not distinguish between the enemy and ourselves
30.不分高低：be equally matched
31.不分前后：level
32.不分青红皂白：make no distinction between right and wrong, indiscriminately
33.不负众望：not inspire popular confidence
34.不干不净：unclean, filthy
35.不敢告劳：be willing to work hard with-out complaint
36.不敢问津：not dare to inquire
37.不敢越雷池一步：dare not overstep the limit
38.不告而别：do a bunk
39.不攻自破：collapse of itself
40.不共戴天：deadly
41.不关痛痒：of no consequence, immaterial
42.不管三七二十一：casting all caution to the winds, regardless of the consequences, recklessly
43.不过尔尔：not better than that--only just so, merely mediocre, just middling
44.不寒而栗：shudder
45.不怀好意：harbor malicious intentions
46.不合时宜：old-fashioned
47.不欢而散：break up in discord
48.不慌不忙：calmly, without hurry or bustle, at leisure
49.不即不离：be neither too close nor too distant
50.不计其数：countless, innumerable
