The Collaborative International Dictionary of English v.0.48:

Sunburn \Sun"burn`\, v. t. [imp. & p. p. Sunburnedor
   Sunburnt; p. pr. & vb. n. Sunburning.]
   To burn or discolor by the sun; to tan.
   [1913 Webster]

         Sunburnt and swarthy though she be.      --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sunburned
    adj 1: suffering from overexposure to direct sunlight [syn:
           sunburned, sunburnt]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "sunburned":
   Titian, adust, ashen, ashy, auburn, bay, bay-colored, bayard,
   blistered, blooming, blowzed, blowzy, brazen, bronze,
   bronze-colored, bronzed, brownish-red, burned, burnt, burnt-up,
   castaneous, chestnut, chestnut-brown, consumed, consumed by fire,
   copper, copper-colored, coppery, cupreous, ferruginous, florid,
   flush, flushed, foxy, full-blooded, glowing, gutted, hectic, henna,
   incinerated, liver-brown, liver-colored, livid-brown, mahogany,
   parched, pyrographic, pyrolyzed, red-complexioned, red-faced,
   red-fleshed, reddish-brown, roan, rosy, rosy-cheeked, rubicund,
   rubiginous, ruddy, ruddy-complexioned, ruddy-faced, rufous, russet,
   russety, rust, rust-colored, rusty, sanguine, scorched, seared,
   singed, terra-cotta