The adjective cacophonous describes loud, harsh sounds, like the cacophonous racket your brother and his band mates make while trying to learn how to play their instruments.
To correctly pronounce cacophonous, accent the second syllable: "cuh-CAW-fuh-nus." It is related to the Greek words kakos, meaning "bad, evil," and phone, or "voice." You may feel like you're facing something evil if you’re bombarded by the cacophonous sounds of, say, political pundits yelling at one another, or the chaotic sounds of traffic and voices on a busy urban street. Cacophonous is the opposite of harmonious.
adj having an unpleasant sound
like the cackles or squawks a hen makes especially after laying an egg
like the sounds of frogs and crows
grating, gravelly, rasping, raspy, rough, scratchy
unpleasantly harsh or grating in sound
gruff, hoarse, husky
deep and harsh sounding as if from shouting or illness or emotion
like the discordant ringing of nonmusical metallic objects striking together
making or causing a harsh and irritating sound
unpleasantly loud and harsh
rending, ripping, splitting
resembling a sound of violent tearing as of something ripped apart or lightning splitting a tree
full of or characterized by loud and nonmusical sounds