premeditated
词根词缀：
meditate v. 思考
medit 思考 + ate 做，造成，使… → 思考
meditation n. 沉思，冥想；默念
medit 思考 + ation 行为，过程，状态，结果 → 沉思，冥想；默念
meditative adj. 沉思的；善于思考的
medit 思考 + ative 有…倾向（性质）的，属于…的 → 沉思的；善于思考的
premeditate v. 预先思考
pre 预先 + meditate 思考 → 预先思考
premeditated adj. 预谋的，事先计划的
premeditate 预先思考 + d → 预谋的，事先计划的
unpremeditated adj. 非预谋的
un 非 + premediated 预谋的 → 非预谋的
数据来源：新东方英语词汇速记大全
相关例句：
There is a world of difference between simple human error and premeditated malevolence.
有一个世界的区别简单的人为错误和有预谋的恶意。
In a case of premeditated murder a life sentence is mandatory
蓄意杀人依法要判无期徒刑。
You brought that shank in with you, it's premeditated murder.
你带刀片进去，你这是谋杀。
I knew that no diplomacy would work if an Arab attack was premeditated.
我很清楚，阿拉伯的进攻若是事先策划好的，那么任何外交努力都无济于事。
The murder was premeditated and particularly brutal.
这次谋杀是有预谋的，非常残忍。
The one-sentence dispatch didn't elaborate as to whether the incident was an accident or premeditated.
这句简单的新闻短讯并未详细描述本次事件属于意外或是预谋事件。