Mr. Gilmer asked him one more question. “About you writing with you left hand, are you ambidextrous, Mr. Ewell?”
“I most positively am not, I can use one hand good as the other. One hand good as the other,” he added, glaring at the defense table.
(Harper Lee, To Kill A Mockingbird)
The speaker says he is not ambidextrous, and at the same time he says ‘I can use one hand good as the other.’ Isn’t this the explanation of ‘ambidextrous? Would you explain why his remark isn’t contradictory?