occult — of or relating to magic, astrology, or any system claiming use or knowledge of secret or supernatural powers or agencies.
oracular — of the nature of, resembling, or suggesting an oracle: an oracular response.
recondite — dealing with very profound, difficult, or abstruse subject matter: a recondite treatise.
secret — done, made, or conducted without the knowledge of others: secret negotiations.
sphinxlike — like the Sphinx; enigmatic or inscrutable
stumping — the lower end of a tree or plant left after the main part falls or is cut off; a standing tree trunk from which the upper part and branches have been removed.
teasing — to irritate or provoke with persistent petty distractions, trifling raillery, or other annoyance, often in sport.
uncertain — not definitely ascertainable or fixed, as in time of occurrence, number, dimensions, or quality.
unintelligible — not intelligible; not capable of being understood.