Screechy

He had an unpleasant screechy voice.

She had an unpleasant screechy voice.

a screechy sound

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.

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