她很聪明，但也冲动且难以捉摸。

She's bright but also ___impulsive and unpredictable.

另一方面，莉莉则更冲动、精力充沛。

Lily, on the other hand, is more ___impulsive and energetic.

做冲动的决定常常导致后悔。

Making ___impulsive decisions often leads to regrets.