shrillish

In stark contrast, sounds are dismally dull; aside from a short musical loop between games, the only noises are a shrillish whistle and the quiet thud of a ball being kicked.

The Usenet Lynx FAQ by Rob Jung 1993

But here a small figure stepped out against us from the shadow of the platform, and a small shrillish voice piped up --

Merry-Garden and Other Stories Arthur Thomas Quiller-Couch 1903

His voice was "low and sweet" -- with just a possibility in it of rising to a shrillish key.

Robert Louis Stevenson: a record, an estimate, and a memorial 1871

'You mean the black flag of poor Jensen?' she said; and when I nodded she began to pity Jensen for his belief in his trophy, which, after all, had brought him no more luck than a sea grave; and then she went on with shrillish laughter to tell me that she had begged it of him to give her to make into a petticoat, 'For it would have made a bonny petticoat, would it not?' she said suddenly, coming to a sharp end and looking me earnestly in the face.

Marjorie 1898