bluff: connotes a good-natured outspokenness and unconventionality: a bartender with a ~ manner. （convention常规习俗习惯，常暗示缺乏创新和独立，如conventional beauty常规（即一般认为）的美，conventional courtesy常规的礼貌）
blunt: suggests directness of expression in disregard of others' feelings: a ~ appraisal of the performance. 评价
brusque: applies to an abrupt sharpness and ungraciousness: a ~ response to a civil question. (gracious优雅礼貌，顾及他人感受，如her gracious acceptance of the award她很有礼貌的接受颁奖)
curt: implies disconcerting shortness or rude conciseness: a ~ comment about the cause of the foul-up. （disconcert让人困惑怀疑自己，如disconcerted by the large audience面对大量观众感到怯场） （foul-up混乱差错mistake or disorganization，如a series of technical foul-ups delayed the launch of the new product一系列技术问题延误了新品上市）
crusty: suggests a harsh or surly manner that may conceal an inner kindliness: a ~ exterior that conceals a heart of gold. （surly不愿说话交流，显得冷酷无礼，如a surly young man一个冷酷的年轻人）
gruff: suggests a hoarse or husky speech which may imply bad temper but more often implies embarrassment or shyness: puts on a ~ pose in front of strangers.
bluff直爽: 褒义，说话不遮掩不拘小节，blunt言率: 说话直接不顾感受，brusque唐突: 形容说话唐突简短无礼(sharp这里不是锐利，而是说话简短)，curt简短粗鲁: 说话过于简短让人不适显得粗鲁，crusty冷酷: 举止严厉冷酷(harsh严厉严峻，surly冷酷无礼)，但内心善良，gruff生硬: 语言粗糙(hoarse, husky都表示声音粗哑)，既可能是脾气不好也可能是因为尴尬害羞。
记忆方法: 1）首字母BBBCCG想成不惭不耻不恭<==直率
2）直率的意思是言行举止唐突无礼mean abrupt and unceremonious in speech or manner.
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