skittish
adjective uk/ˈskɪt.ɪʃ/ us/ˈskɪt̬.ɪʃ/
（人或动物）不安的，易受惊的
(of people and animals) nervous or easily frightened
My horse is very skittish, so I have to keep him away from traffic. 我的马很容易受惊，因此我得让它远离车流。
Investors are skittish about the impact of an economic downturn. 投资者对经济衰退所产生的影响感到不安。
（人）易变的;反复无常的
(of a person) not serious and likely to change their beliefs or opinions often
Marilyn was like a child, playful and skittish one moment, sulky and withdrawn the next.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。