彼は___負けて、子供を喜ばせた。
Q. Which adverb means 'on purpose (with intent to deceive)'?
Translation
He lost on purpose to make the child happy.
Explanation
わざと means deliberately, often feigning: わざと負ける 'throw the game'. わざわざ means taking the trouble to do something, たまたま 'by chance', つい 'unintentionally'.