deliberate, voluntary, or intentional

The coroner ruled the death willful murder.

unreasonably stubborn or headstrong; self-willed.

adjective

flexible , willing , yielding , involuntary , unwilling

adjective

adamant , bullheaded , contumacious , determined , dogged , fractious , froward , headstrong , inflexible , intractable , intransigent , mulish , obdurate , persistent , pertinacious , perverse , pigheaded , refractory , resolved , self-willed , stiff-necked , uncompromising , unyielding , conscious , contemplated , deliberate , designed , intended , intentional , planned , premeditated , purposeful , studied , unforced , volitional , willed , willing , witting , voluntary , free , spontaneous , uncompelled , hardheaded , tenacious , capricious , disobedient , obstinate , stubborn , unruly