bois ‧ ter ‧ ous /ˈbɔɪst ə rəs/ BrE AmE adjective
[ Date: 1400-1500 ; Origin: boistous 'rough' (14-16 centuries) , from Old French boistos ]
someone, especially a child, who is boisterous makes a lot of noise and has a lot of energy:
a class of boisterous five-year-olds