好话说尽，坏事做绝

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mouth pious sentiments while doing the most dastardly deeds; a sinner under the guise of a saint; For all their fine words, they stop at no crime.; mouth the nicest things while committing the most outrageous crimes; rattling out the most attractive rhetoric while doing the dirtiest things; say all the fine things while doing all the vilest actions; say every fine word and do every foul deed