"shriller" in the adjective sense
1. shrill, sharp
having or emitting a high-pitched and sharp tone or tones
"a shrill whistle"
"a shrill gaiety"
2. strident, shrill
being sharply insistent on being heard
"strident demands"
"shrill criticism"
3. shrill
of colors that are bright and gaudy
"a shrill turquoise"
Source: WordNet® (An amazing lexical database of English)
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