BRACK: George Tesman is really an ingenuous creature, Mrs. Hedda. Hedda Gabler; act 3, p. 108 Based on the context of the play and Brack’s own character, as well as his excerpted lines above, ingenuous means
Ingenuous means being simple, innocent or childlike. It makes sense that Brack, a cynical man, would refer to George as ingenous since he seem foolishs and gets manipulated by his wife often