Synset

of an obscure nature
<adj.all>   freq. cnt.: 17 freq. cnt.: 14 freq. cnt.: 2 freq. cnt.: 1

cryptic

cryptical

deep

inscrutable

mysterious

mystifying

sample sentences

"the new insurance policy is written without cryptic or mysterious terms"
"a deep dark secret"
"the inscrutable workings of Providence"
"in its mysterious past it encompasses all the dim origins of life"- Rachel Carson
"rituals totally mystifying to visitors from other lands"