"forceful" in the adjective sense
1. forceful
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"
2. emphatic, forceful
forceful and definite in expression or action
"the document contained a particularly emphatic guarantee of religious liberty"
Source: WordNet® (An amazing lexical database of English)
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