IPA: /əˈsɔltɪv/
KK: /əˈsɔltɪv/
Relating to or having the nature of an attack or aggressive behavior.
The assaultive behavior of the dog made the owner nervous.
Assaultive is formed from "assault" (from Old French *assaut*, meaning a sudden attack) and "-ive" (meaning having the nature of). The word "assaultive" describes something that has the nature of an attack or is aggressive in nature.
Think of an 'attack' ('assault') and remember that 'assaultive' means having the nature of an attack.