wan

verbs

become pale and sickly

wan

is a type of (narrower)

get sick

"She fell sick last Friday, and now she is in the hospital"

come down, sicken

adjectives

(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"

pale, pallid, sick, wan

abnormally deficient in color as suggesting physical or emotional distress

"the pallid face of the invalid"; "her wan face suddenly flushed"

pale, pallid, wan

is derived from

wanness

lacking vitality as from weariness or illness or unhappiness

"a wan smile"

wan

is similar to

not animated or enlivened; dull

unanimated