Secret.
ETYM Latin crypticus, Greek kryptikos, from kryptein to hide.
Mysterious; secret; concealing.
1. Having a puzzling terseness.
2. Of an obscure nature; SYN. cryptical, deep, inscrutable, mysterious, mystifying.
ETYM Latin occultus, p. p. of occulere to cover up, hide; ob (see Ob-) + a root prob.akin to Eng. hell: cf. French occulte.
1. Hidden from the eye or the understanding; secret; concealed; mysterious.
2. Related to the occult sciences, such as alchemy.
3. Mysterious; hidden; magical; supernatural.
ETYM Latin reconditus, p. p. of recondere to put up again, to lay up, to conceal; pref. re- re- + condere to bring or lay together. Related to Abscond.
1. Hidden from the mental or intellectual view; secret; abstruse.
2. Dealing in things abstruse; profound; searching.
Out of the way; little known.
Concealed; abstruse; erudite.