complexion has 2 distinct synonyms spread across 1 of its 6 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the coloring of a person's face
a combination that results from coupling or interlinking
“diphthongs are complexions of vowels”
a point of view or general attitude or inclination
“he altered the complexion of his times”
texture and appearance of the skin of the face
(obsolete) a combination of elements (of dryness and warmth or of the four humors) that was once believed to determine a person's health and temperament
give a certain color to
“The setting sun complexioned the hills”
Synonyms, antonyms and the broader and narrower relations for complexion come from Princeton University’s WordNet. Full sources and licences.