And what a demonstrative word it is.
“Harsh or discordant word sounds; the opposite of euphony.”
For a sample out of classic kid lit, read the “Jabberwocky” poem from Lewis Carroll’s Through the Looking Glass.
“Beware the Jabberwock, my son!
The jaws that bite, the claws that catch!
Beware the Jubjub bird, and shun
The frumious Bandersnatch!”
Note the conspicuous lack of harmony, the variety of discordant sounds, and as if to further accentuate the tension, the inclusion of harsh, nonsensical words.