In the title compound, C25H26N2OS, the diethyl-substituted benzene ring forms dihedral angles of 67.38 (9) and 55.32 (9)° with the terminal benzene rings. The mol-ecule adopts a trans-cis conformation with respect to the orientations of the di-phenyl-methane and 1,3-di-ethyl-benzene groups with respect to the S atom across the C-N bonds. This conformation is stabilized by an intra-molecular N-H⋯O hydrogen bond, which generates an S(6) ring. In the crystal, pairs of N-H⋯S hydrogen bonds link the mol-ecules into inversion dimers, forming R 2 (2)(6) loops. The dimer linkage is reinforced by a pair of C-H⋯S hydrogen bonds, which generate R 2 (2)(8) loops. Weak C-H⋯π and π-π [centroid-centroid seperation = 3.8821 (10) Å] inter-actions also occur in the crystal structure.