きゅうげき急激kyuugeki
1.
Describing a sudden and significant change or event that occurs rapidly and often unexpectedly.
2.
Characterizing a situation that escalates or deteriorates at a fast pace, highlighting the intensity of the transformation.
3.
Indicating a drastic shift in conditions or circumstances, where the degree of change is both swift and profound.
Example:
その党は急激にのびた。