IPA: /ˈɪn.stɪ.ɡə.tɪv/
KK: /ɪnˈstɪɡəˌtɪv/
Causing or encouraging someone to take action, often in a rebellious or provocative way.
The instigative speech motivated the crowd to protest against the unfair laws.
Instigative is formed from "instigare" (meaning to incite or urge on) and the suffix "-ive" (meaning having the nature of). The word describes something that has the nature of inciting or urging action.
Think of something that 'urges on' or 'incites' action — that's what instigative means.