1Sudden, abrupt, or drastic; describes a change (in temperature, numbers, circumstances, etc.) that happens sharply and quickly.
この地域は急激な人口減少に苦しんでいる。
This region is suffering from a rapid decline in population.
急激な運動は体に負担がかかる。
Sudden intense exercise puts strain on the body.
為替レートが急激に変動した。
The exchange rate fluctuated sharply.