/ ˈfɔːsfl; NAmE ˈfɔːrsfl/ adjective
1.
( of people ) expressing opinions firmly and clearly in a way that persuades other people to believe them
SYN assertive :
a forceful woman / speaker
a forceful personality
2.
( of opinions, etc. ) expressed firmly and clearly so that other people believe them :
a forceful argument / speech
3.
using force :
the forceful suppression of minorities
► force·ful·ly / -fəli; NAmE / adverb :
He argued his case forcefully.
► force·ful·ness noun [ U ]