madcap 5mAd7kAp adj [before n] dated very foolish and (of a plan) not likely to succeed 愚蠢的，（计划）不现实的，不可能实现的 The madcap antics of the clowns made us laugh. 小丑们的滑稽愚蠢的动作逗得我们直笑。 He has a madcap scheme to turn his house into a museum. 他有个不现实的计划，想把屋子改造成博物馆。