adverb
terribly; awfully; extremely; severely
Adverbial form of ひどい, used to intensify adjectives, verbs, or states with a negative or extreme connotation. Often translates to 'terribly', 'awfully', or 'very much'.
See also: ひどい
昨日はひどく疲れた。
I was terribly tired yesterday.
彼はひどく怒っていた。
He was extremely angry.
その知らせに彼女はひどく驚いた。
She was awfully surprised at the news.
ひどい is the adjective meaning 'terrible' or 'cruel'; ひどく is its adverbial form, used to modify verbs or adjectives.
Adverbial form of the adjective ひどい (terrible, cruel). The kanji 酷 carries the meaning of 'severe' or 'cruel', while 非道 literally means 'unjust path', but the kana spelling is most common.