wan (adj.)

Old English wann "dark, dusky, lacking luster," later "leaden, pale, gray," of uncertain origin, and not found in other Germanic languages. The connecting notion is colorlessness. Perhaps related to wane. Related: Wanly; wanness.

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Definitions of wan from WordNet
wan (adj.)
(of light) lacking in intensity or brightness; dim or feeble;
the wan light of dawn
the pale (or wan) stars
Synonyms: pale / pallid / sick
wan (adj.)
abnormally deficient in color as suggesting physical or emotional distress;
her wan face suddenly flushed
Synonyms: pale / pallid
wan (adj.)
lacking vitality as from weariness or illness or unhappiness;
a wan smile
wan (v.)
become pale and sickly;
wan (n.)
a computer network that spans a wider area than does a local area network;
Synonyms: wide area network