capricious
adj. （态度或行为）反复无常的，任性的；变幻莫测的，多变的；不合逻辑的，不合情理的
例句
He was accused of being capricious and undemocratic.
他被指责反复无常，不讲民主。
《柯林斯英汉双解大词典》
Calling them a bunch of capricious kids with half-formed ideas does them an injustice.
把他们称作一群懵懂无知、喜怒无常的孩子是冤枉了他们。
They're not the menials and servants of capricious gods.
他们也不是变幻无测上帝的奴仆。
