mid 17th century: from Greek esōterikos, from esōterō, comparative of esō ‘within’, from es, eis ‘into’. Compare with exoteric
Adjective
Similar Words: abstruse obscure arcane recherché rarefied recondite abstract difficult hard puzzling perplexing enigmatic inscrutable cryptic Delphic complex complicated involved above one's head over one's head incomprehensible opaque unfathomable impenetrable mysterious occult little known hidden secret private mystic magical cabbalistic involuted
Opposites: simple familiar