forceful

Adjective

• forceful and definite in expression or action
  • the document contained a particularly emphatic guarantee of religious liberty
    

• characterized by or full of force or strength (often but not necessarily physical)
  • a forceful speaker
    
  • a forceful personality
    
  • forceful measures
    
  • a forceful plan for peace
    

Related words

• Antonyms: 
  forceless , unforceful