In this study, the goal was to investigate the shear strength properties of superfine cement (SC) stabilized clayey soil (CS). In this regard, standard compaction tests were run on the clayey soil specimens stabilized with 8, 10, and 12% SC to determine their optimum moisture contents and the maximum dry densities. Thereafter, unconsolidated undrained (UU) triaxial tests were conducted on them to find out their shear strength parameters and stress-strain characteristics at different time intervals under wet-cured and air-dried conditions. The shear strength parameters-namely the cohesion intercept and the internal friction angle of CS-increased with the stabilization of SC under both curing conditions. Additionally, the shear strength parameters of SC-stabilized CS were increased more with the increase of SC content and time under both curing conditions. The internal friction angles of air-dried specimens were higher than those of wet-cured specimens. On the other hand, the cohesion intercepts of wet-cured specimens were greater than those of air-dried specimens. The stress-strain behavior of CS was also influenced with the stabilization of SC such that as the stresses of CS were increased with the increase of SC content and time their strains decreased and they experienced brittle failures under both wet-cured and air-dried conditions.