Who was foolish, short tempered and complaining?

Lizzy is described this way in Chapter Twenty.

"Pardon me for interrupting you, Madam,'' cried Mr. Collins; "but if she is really headstrong and foolish, I know not whether she would altogether be a very desirable wife to a man in my situation, who naturally looks for happiness in the marriage state. If therefore she actually persists in rejecting my suit, perhaps it were better not to force her into accepting me, because if liable to such defects of temper, she could not contribute much to my felicity.''