Denoting something extremely intense, fierce, or powerful; used as a na-adjective (often in forms like 猛烈な or 猛烈に).
猛烈な雨で道路が冠水した。
A torrential rain flooded the roads.
彼は猛烈に働いて短期間で昇進した。
He worked intensely and was promoted in a short time.
年末は猛烈な忙しさになる会社が多い。
Many companies become extremely busy at the end of the year.