say it: BOY-stur-uhs
boisterous is an adjective meaning "noisy and lacking in restraint or discipline". It carries 3 recorded senses.
noisy and lacking in restraint or discipline
“a boisterous crowd”
“a social gathering that became rambunctious and out of hand”
“a robustious group of teenagers”
“beneath the rumbustious surface of his paintings is sympathy for the vulnerability of ordinary human beings”
“an unruly class”
full of rough and exuberant animal spirits
“boisterous practical jokes”
“knockabout comedy”
Definitions, synonyms and semantic relations for boisterous come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.