Adjective forceful has 2 senses
  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"
    Antonyms:
    forceless, unforceful, weak, wimpish, wimpy
  2. emphatic, forceful - forceful and definite in expression or action; "the document contained a particularly emphatic guarantee of religious liberty"
    Antonym: unassertive (indirect, via assertive)
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