high-pitched; shrill
甲高い叫び声が聞こえた。
A shrill scream was heard.
甲高く笑う声が教室に響いていた。
Shrill laughter echoed through the classroom.
あの鳥の甲高かった鳴き声が今でも耳に残る。
That bird's high-pitched call still remains in my ears.