sudden, abrupt, rapid...

stimulus, stimulation, irritation (esp. of the body...

dramatic, exciting, touching...

violent shock, agitation, turbulence...

encouragement, spurring (on), cheering (on)

deep emotion, impression, inspiration

violent, furious, tempestuous...

extreme (measure, idea, etc.)...

intensification, aggravation

fierce battle, hard-fought battle, hot contest...

sudden change, upheaval

dramatic decrease, sharp drop, sudden fall

rage, fury

crash, smashing (into), ramming...

heated argument, heated discussion, heated debate

sharp increase, sudden rise

violence, vehemence, fury...

severe earthquake, violent tremor

sharp pain, acute pain, intense pain

exhausting work, hard work, severe duty

extremely, terrifically, super

intense, violent, severe...

raging stream, rapids

violent emotion, passion, fury

fierce fighting

high praise, lavish praise, enthusiastic praise...

excitement, exasperation, indignation...

extremely expensive

fury, flying into a rage, outrage

to boil, to seethe, to roil (e.g. waterfall...