This is the 5480th most frequent Japanese word.
うそぶく
To boast, exaggerate, or pretend indifference.
In this sentence, 'うそぶく' is used to denote a dismissive or indifferent attitude while responding to a query about the exam results.
彼は試験の結果について聞かれると、うそぶいて答えを避けた。
When he was asked about the results of the exam, he evaded answer with a casual attitude.
Here, 'うそぶく' is used to imply a manner of replying that reflects nonchalance or disregard, avoiding direct engagement.
彼女は自分が失敗した理由を尋ねられると、うそぶいたように曖昧な返事をした。
When asked about the reason for her failure, she ambiguously replied with a casual attitude.
In this context, 'うそぶく' reflects an attitude of indifference or arrogant dismissal in response to criticism.