Bolshie is a slang word often used to describe someone with strong and sometimes rebellious opinions. Synonyms for bolshie include assertive, bold, defiant, determined, obstinate, and resolute. These words all convey a sense of strength and determination, but each has a slightly different nuance. For example, defiant implies a more confrontational attitude, while resolute implies determination in the face of adversity. Other synonyms for bolshie could include headstrong, indomitable, irrepressible, steadfast, and unyielding. Regardless of the word used, someone who is bolshie is not easily swayed and will fiercely defend their beliefs.