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apollonian

adjective

pertaining to the cult of Apollo.
(lowercase) serene, calm, or well-balanced; poised and disciplined.
(lowercase) having the properties of or preferring classic beauty.Compare Dionysian(def 2).

adjective

of or relating to Apollo or the cult of Apollo
(sometimes not capital) (in the philosophy of Nietzsche) denoting or relating to the set of static qualities that encompass form, reason, harmony, sobriety, etc
(often not capital) harmonious; serene; ordered

adj.

1660s, from Apollo (Greek Apollon) + -ian. The Greek adjective was Apollonios. The word also is attested in English as Apollinarian (1753), Apolline (c.1600).