vo ‧ cif ‧ er ‧ ous /vəˈsɪf ə rəs, vəʊ- $ voʊ-/ BrE AmE adjective formal
[ Date: 1600-1700 ; Language: Latin ; Origin: vociferari 'to talk loudly' , from vox ( ⇨ ↑ voice 1 ) + ferre 'to carry' ]
expressing your opinions loudly and strongly:
a vociferous opponent of the plan
vociferous in
The minority population became more vociferous in its demands.
—vociferously adverb