Green’s Dictionary of Slang

peaked adj.

also peeked
[SE peak, to look sickly]

looking ill, tired.

[US]T. Haliburton Sam Slick in England I 199: There was a lawyer, a-standin’ up by the grove, lookin’ as peeked and as forlorn, as an onmated loon.
[UK]J. Mair Hbk of Phrases 111: Peaked, sickly looking.
[US] ‘Central Connecticut Word-List’ in DN III:i 15: peaked, adj. Thin, emaciated, as from sickness.
[UK]G. Stratton-Porter Harvester 366: Why, you poor child! No wonder you are looking so thin and peaked!
[US]Ade Hand-made Fables 298: You look Peaked and All In.
[US]D. Runyon ‘Earthquake’ in Runyon on Broadway (1954) 168: You are looking somewhat peaked.
[US]J. Spenser Limey 102: You’re lookin’ peeked.
[UK]A. Christie Hollow (1950) 49: You’re looking rather peaked.
[US]E. De Roo Go, Man, Go! 124: You looked pretty peaked when those cops asked you questions. I watched you like a hawk, I know.
[US]S. Longstreet Flesh Peddlers (1964) 315: You look peaked yourself.
[UK]C. Gaines Stay Hungry 155: A peaked-looking individual.
[US]S. King It (1987) 635: You’re looking a bit peaked, Mr Mikey.
[Aus]E. George ‘I, Richard’ Evidence Exposed (1999) 113: Feel peaked a bit, Malkie.