adjective
1.
having a spiritual meaning or reality that is neither apparent to the senses nor obvious to the intelligence
the Church is the mystical body of Christ
Synonyms: anagogic, mystic, telestic
Related Word: abysmal, deep, profound; absolute, categorical, ultimate; divine, holy, sacred, spiritual; miraculous, supernatural, supranatural
2.
Synonyms: secret 1, clandestine, covert, furtive, hole-and-corner, hugger-mugger, hush-hush, sneak, stealthy, sub-rosa