Anhydrous synthesis of MXene facilitates the control over the surface functionalization and the final physicochemical properties. Here, we propose a novel anhydrous etching solution, consisting of high-boiling-point dimethylsulfoxide as organic medium, NH₄HF₂ as etchant, CH3SO3H as acid, and NH₄PF₆ as intercalant. This anhydrous solution does not only enable one to increase the reaction temperature up to 100 °C for accelerating the etching and delamination of Ti₃AlC₂ MAX crystals, but also suppresses the destructive side reaction of the produced Ti₃C₂T_x MXene flakes. Consequently, the etching reaction is completed in 4 h at 100 °C and produces high-quality monolayer Ti₃C₂T_x MXene with an electrical conductivity of 8,200 S cm-1 and a yield of over 70%. The synthesized Ti₃C₂T_x exhibits more F-terminations than conventional aqueous Ti₃C₂T_x. The atypical surface structure of Ti₃C₂T_x MXene leads to an exceptionally high ultimate tensile strength (167 ± 8 MPa), which is about 5 times larger than the ones synthesized in aqueous HF solution (31.7 ± 7.8 MPa).