Relating to, involving, or characteristic of assassination; tending toward assassination.
From assassinate + -ive suffix. The -ive suffix creates adjectives meaning 'tending to do' or 'relating to.'
The -ive suffix is ancient and productive—it can be added to almost any verb to create an adjective, which is why we have 'creative,' 'destructive,' 'imaginative,' but rarely use 'assassinative.'
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