In the title compound, C17H18F2N2O2, the imidazolidine ring system exists in a twist conformation. The mean plane through this ring system forms dihedral angles of 80.8 (8)° and 66.2 (13)°, with the benzene rings. The dihedral angle between the benzene rings is 52.0 (14)°. Two intramolecular O—HN hydrogen bonds each generate S(6) ring motifs. In the crystal, weak C—HO hydrogen bonds form dimers, which are connected by further C—HO interactions.