Definitions of explosive:

• noun:   a chemical substance that undergoes a rapid chemical change (with the production of gas) on being heated or struck
• adjective:   liable to lead to sudden change or violence

  Example: "An explosive issue"

• adjective:   tending or serving to explode or characterized by explosion or sudden outburst

  Example: "An explosive device"

• adjective:   sudden and loud

  Example: "An explosive laugh"