adj.毫无准备的，非预谋的，非事先策划的

The accident was entirely unpremeditated; he didn't mean to hit the pedestrian.
这次事故完全是意外发生的，他并没有意图撞到行人。
His laughter was spontaneous and unpremeditated, a genuine expression of joy.
他的笑声是自发的，未经深思熟虑，是他内心喜悦的真实流露。
She wrote the song in an unpremeditated moment, while sitting by the lake.
她在湖边坐着的时候，突然有了灵感，即兴创作了这首歌。
The attacker's actions were unpremeditated and seemed to be driven by anger.
攻击者的行为是突发的，似乎是出于愤怒。
He decided to quit his job unpremeditatedly, without any prior planning.
他决定辞职时并未事先计划，非常突然。
The decision to forgive him was an unpremeditated act of compassion.
原谅他的决定是一个毫无预谋的慈悲之举。
Her reaction to the news was completely unpremeditated; she simply cried.
她对这个消息的反应是未经思考的，只是哭了出来。
The artist's painting style is known for its unpremeditated, abstract forms.
这位艺术家的绘画风格以其未加预设、抽象的形式而闻名。
His generosity in helping others was an unpremeditated response to their needs.
他对别人的慷慨帮助是对他们需求的无意识回应。
The child's laughter was an unfiltered, unpremeditated expression of happiness.
孩子的笑声是纯真且未经思考的快乐表现。