In fact, Gwendolen, not intending it, but intending the contrary, had offended her hostess, who, though not a splenetic or vindictive woman, had her susceptibilities.
If you describe someone as splenetic, you mean that they easily become very angry about things. retired military men with splenetic opinions. = peevish. bad-tempered and often angry (spleneticus, from splen; SPLEEN)
very irritable; "bristly exchanges between the White House and the press"; "he became prickly and spiteful"; "witty and waspish about his colleagues"