wan

(of light) lacking in intensity or brightness; dim or feeble; "the pale light of a half moon"; "a pale sun"; "the late afternoon light coming through the el tracks fell in pale oblongs on the street"; "a pallid sky"; "the pale (or wan) stars"; "the wan light of dawn"

abnormally deficient in color as suggesting physical or emotional distress; "the pallid face of the invalid"; "her wan face suddenly flushed"

lacking vitality as from weariness or illness or unhappiness; "a wan smile"

a computer network that spans a wider area than does a local area network

become pale and sickly