Stupidity is in the blood
Mrs. Bennet always praises her daughters. But during the talk with Mr. Bingley, Mr. Bennet affirms that all his daughters are “silly and ignorant like their mother, the exception being Lizzy, who has something more of the killer instinct than her sisters”. He is sure that the stupidity runs in their family. Instead of the positive recommendation, Mr. Bennet ridicules his girls. It sounds ironically, because he doesn’t introduce girls to Mr. Bingley properly.
Marriage as a kind of sufferings
Elizabeth is confident that she and her sisters must “defend Hertfordshire from all enemies until such time as they are dead, rendered lame, or married”. Readers can notice the ironical meaning of her words. She affirms that marriage is a disease and compares it with death, but she has never fallen in love. She can't talk about love without experiencing this feeling.
Senseless skills
Mr. Bennet argues about combat skill with zombies. He affirms that “being practiced enough to kill a few of the sorry stricken does not make his daughters sensible”. He thinks that these skills are useful “for the amusement of handsome officers”. The irony is based on the fact that Mr. Bennet doesn’t even suspect that combat skill makes Elizabeth and her sisters brave and strong.
