Arcane
Nobody knows how long the aliens have lived there, because liens are very arcane and smart creatures.
Occult
Bring up a topic that touches on the supernatural, mysticism,reincarnation, spiritualism or the occult.
Inaccessible
The brain is an inaccessible organ
Esoteric
Large data sets are no longer esoteric concerns for a few big companies,but are becoming commonplace.
Impenetrable
But there seemed to be an impenetrable barrier around her—as if she wassealed away by Tom
Enigmatic
The true identity of Mona Lisa and her enigmatic smile have intrigued artlovers around the world.
Recondite
An erudite scholar was noted for his recondite thoughts.
Elusive
Happiness itself can be defined in many different ways, it may have allkinds of components, it may be a life's work, or even no work at all, but weare, most of us, in pursuit of this elusive goal.
Abstruse
I've been working on this abstruse problem ever since last year.
Inscrutable
It's one of the world's leading - and somewhat inscrutable - technologycompanies.
Uncanny
Life has an uncanny way of responding to your need.
Opaque
At the neck of the wrecked deck, he checked the opaque cheque.
Cryptic
Leave cryptic messages on the typewriters.
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