what do impulsive mean?

Answer 1

Impulsive means acting without thinking.

The child was impulsive when he kicked his sister.

Answer 2

thanks very much ms. sue :) that mean the same thing as spontaneous?

Answer 3

Yes, they are very close in meaning.

Impulsive tends to be negative -- as my example shows. Spontaneous tends to be positive.

Example: The students broke into spontaneous applause when heroine walked on the stage.