Mys*te"ri*arch (?), n. [L. mysteriarches, Gr. &?;; &?; mystery + &?;
chief.] One presiding over mysteries. [Obs.]
Mys*te"ri*ous (?), a. [F. mystèrieux. See 1st Mystery.] Of or
pertaining to mystery; containing a mystery; difficult or impossible to
understand; obscure; not revealed or explained; enigmatical;
incomprehensible.
God at last To Satan, first in sin, his doom applied, Thought in
mysterious terms.
Milton.
Syn. -- Obscure; secret; occult; dark; mystic; cabalistic; enigmatical;
unintelligible; incomprehensible.
Mys*te"ri*ous*ly, adv. In a mysterious manner.
Mys*te"ri*ous*ness, n. 1. The state or quality of being mysterious.