unpremeditated
adj. 非預謀的
1. not prepared or planned in advance;
2. not premeditated
This happy event--supposing it to be such--could only have occurred at an unpremeditated moment.
這件愉快的事情——就算它愉快——只能發生在毫無預謀的時刻。
The unpremeditated crime that Picasso commits to oneself is downhearted, should destroy copperplate depict almost.
畢加索對自己犯的過失悶悶不樂, 幾乎要將銅版刻畫一毀了之.