wan

lacking vitality as from weariness or illness or unhappiness

a wan smile

abnormally deficient in color as suggesting physical or emotional distress

the pallid face of the invalid

her wan face suddenly flushed

(of light) lacking in intensity or brightness; dim or feeble

the pale light of a half moon

a pale sun

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

become pale and sickly