vt.1. 使人泄气；使人沮丧；使人丧失信心2. 不肯相信；怀疑His reports about the war affairs in the Middle-East area have been discredited because it is realized that the reporter used false information.这位记者写的有关中东地区战况的报导人们已经不相信了，因为大家已经认识到他使用了不真实的资料。
The idea that the earth is flat has long been discredited.地球是方的这种说法早已不为人们所相信了。
As far as this subject, later researches discredited the earlier conclusions.这个课题后来的研究推翻了早先的结论。