His actions were clearly pre-meditated, not just impulsive.

pre-meditated 是由前缀 pre-（表示"预先"）和动词 meditate（"思考、谋划"）的过去分词形式 meditated 组合而成。pre- 表示"在...之前"，meditate 表示"深思、谋划"，所以 pre-meditated 的字面意思是"预先谋划好的"，即"预谋的"。在法律语境中，pre-meditated 特指犯罪行为的"有预谋的"。