adj. 25B6; adjective
a forceful personality : DYNAMIC, energetic, assertive, authoritative, vigorous, powerful, strong, pushy, driving, determined, insistent, commanding, dominant, domineering; informal bossy, in-your-face, go-ahead, feisty.
a forceful argument : COGENT, convincing, compelling, strong, powerful, potent, weighty, effective, well founded, telling, persuasive, irresistible, eloquent, coherent.
weak, submissive, unconvincing.