wan

Abnormally deficient in color as suggesting physical or emotional distress.

“her wan face suddenly flushed”

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

“the pale (or wan) stars”

“the wan light of dawn”

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.