forceful (
http://definr.com/forceful)
adj 1: 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" [ant:
forceless]
2: forceful and definite in expression or action; "the document
contained a particularly emphatic guarantee of religious
liberty" [syn:
emphatic]