Recondite /(rĕk"ŏn*dīt [or] rē̇kŏn"dĭt; 277)/

Rec·on·dite

Recondite

a.
  1. Hidden from the mental or intellectual view; secret; abstruse; as, recondite causes of things.
  2. Dealing in things abstruse; profound; searching; as, recondite studies.