screechy

adjective2

1. •
   Resembling a screech.

   • Where these Atlantics fell from acoustic grace, however, was in their feeble screechy little whistle, so different from the N.B.R. mellow standard pattern. — 1952
2. •
   Given to screeching.

   • She has a screechy voice that really grates on my nerves, like a dentist's drill.