IPA: /ˈʃrɪlər/
KK: /ˈʃrɪlər/
Having a high-pitched and piercing sound, often more intense than a regular shrill sound.
The shriller tone of the alarm made everyone jump.
Comparative: shriller
Superlative: shrillest
Shriller → It is formed from "shrill" (from Old English "scryllan", meaning to cry out or scream) and the suffix "-er" (meaning one who). The word "shriller" describes someone or something that produces a higher-pitched or more piercing sound than another.
Think of someone who 'cries out' ('scryllan') in a 'higher pitch' — that's why shriller means producing a sharper sound.