i-adjective
extreme; excessive; terrible; intense; severe; serious; tremendous; heavy (damage)
Describes a degree or state that is remarkably high, often with a negative connotation. Commonly used with nouns like 被害 (damage), 差 (difference), 誤り (mistake), or 寒さ (cold).
The damage from this earthquake is severe.
彼の説明には甚だしい誤りがあった。
There was a serious mistake in his explanation.