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
Webster's English Dictionary