Webster's English Dictionary

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mysterious

mys.te.ri.ous \mis-'tir-e--*s\ aj 1: of, relating to, or implying a mystery 
   : OBSCURE  2: stirred by or attracted to the inexplicable ver or explain. 
   MYSTERIOUS applies to what excites wonder, curiosity, or surprise while 
   baffling or eluding efforts to explain or understand; INSCRUTABLE applies 
   to what defies all efforts to understand and leaves one with a feeling of 
   hopelessness or defeat or exasperation - mys.te.ri.ous.ly av SYN syn 
   MYSTERIOUS, INSCRUTABLE mean beyond one's power to disco