性急な
　　It seems a little brash to reject his proposal for now.　今の時点で彼の提案を拒絶するのは少々性急でしょう。

軽率な
　　She was sometimes very brash. One day, I saw her tearing some old receipts and soon she found they were necessary ones.　彼女は とても軽率な面があった。古い領収書を破ったあと、すぐに必要なものだったことに気づいたりしていた。

生意気な
　　When the brash boy said that his parents were awfully stupid, I almost shouted at him, “Zip it up.”　その生意気な 少年が自分の両親は恐ろしいほど馬鹿だと言ったときには、思わず「黙れ」というところだった。