Mystical

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Middle English (in the sense ‘mystical meaning’): from Old French mystique, or via Latin from Greek mustikos, from mustēs ‘initiated person’ from muein ‘close the eyes or lips’, also ‘initiate’. The current sense of the noun dates from the late 17th century.

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From mystic +‎ -al

etymonline

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mystical (adj.)

late 15c., "enigmatic, obscure, symbolic," from mystic + -al (1). Meaning "having spiritual significance" is from 1520s. Related: Mystically.