freakishness

noun [抽象名词]异想；易变性

Whether moved only by her ordinary freakishness, or because an evil spirit prompted her, she put up her small forefinger, and touched the scarlet letter.
不知孩于和往常一样想要调皮，还是受到一个邪恶的精灵的指使，她举起她小小的食指，去摸那红字。