1) Acting or driven with force 2) Animated 3) Ardent 4) Brave 5) Bruising 6) Categorical 7) Cogent 8) Convincing 9) Definite 10) Determined 11) Drastic 12) Effective; vigorous 13) Emphatic 14) Energetic 15) Exclamatory 16) Feisty 17) Firm 18) Forcible 19) Full of force 20) Gripping 21) High-spirited 1) Assertive 2) Bossy 3) Cogent 4) Convincing 5) Drastic 6) Driving 7) Dynamic 8) Effective 9) Emphatic 10) Energetic 11) Exclamatory 12) Forcible 13) Formidable 14) Healthy 15) Hearty 16) Impellent 17) Incisive 18) Lively 19) Persuasive 20) Pithy 21) Powerful 22) Punchy 23) Strong 24) Vociferous 
• (a.) Full of or processing force; exerting force; mighty.
Force'ful adjective Full of or processing force; exerting force; mighty. -- 
[adj] - characterized by or full of force or strength (often but not necessarily physical)
adjective 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`
full of force; powerful; vigorous; effective: a forceful plea for peace. · acting or driven with force.
characterized by power or strength