Sickly; peaked. / Characterised by peaks.

The quality of being peaky.

plural of peaky blinder

(historical) A member of the Peaky Blinders gang. / (archaic) A peaked cap like that worn by a peaky blinder, especially when worn with the peak pulled down to the side of the head.

A street gang based in Birmingham, England, that operated from the end of the 19th century until after the First World War. Gang members had a distinctive appearance: close-cropped hair, bell-bottomed trousers, peaked caps, and a white scarf knotted at the throat.