Look up mysterious or mysteriousness in Wiktionary, the free dictionary. Aliko MohammadDangote GCON is a Nigerian businessman known for his key roles in Dangote Group and Dangote Refinery. In 2011, he was appointed as member of the economic management team by President Goodluck Jonathan. 2 days ago · The meaning of MYSTERIOUS is of, relating to, or constituting mystery. How to use mysterious in a sentence. The costume is mysterious in its poverty as well as in its flair for incoherent details. MYSTERIOUS definition: full of, characterized by, or involving mystery. See examples of mysterious used in a sentence. Someone or something that is mysterious is strange and is not known about or understood. He died in mysterious circumstances. A mysterious illness confined him to bed for over a month. The whole thing … 1. involving or full of mystery: a mysterious phone call. suggesting or implying a mystery: a mysterious smile. puzzling; inexplicable: a mysterious inscription on an ancient tomb.