Of, relating to, or characteristic of the Peak District in Derbyshire.
In early use apparently sometimes more generally: rough, remote, wild.
Late 16th century; earliest use found in William Warner (d. 1609), poet and lawyer. From Peak + -ish.
Somewhat peaked or pointed; characterized by peaks.
Mid 18th century; earliest use found in William Ellis (c1700–1758), agriculturist and writer. From peak + -ish.
Somewhat sickly; pinched, unhealthy.
Mid 19th century; earliest use found in Benjamin Smart (d. 1872), elocutionist and grammarian. Probably alteration of peaky, with suffix substitution.