soi-disant

Moreover, Lady Dudley flattered herself with filling the next best part to the principal, that of confidante with Mrs. Courtenaye. Constance had, however, too much good taste, as well as good feeling, for this; she had betrayed her jealousy, not confessed it. Still, this was enough for her soi-disant friend, who went on torturing her with stories about Lady Marchmont's powers of fascination, and Lady Marchmont's coquetry.