(of a person) not serious and likely to change their beliefs or opinions often

中文解释

（人）易变的;反复无常的 Marilyn was like a child, playful and skittish one moment, sulky and withdrawn the next. 玛丽莲真像个孩子，一会儿顽皮活泼，一会儿又会怏怏不快、沉默不语。