expression, noun
harsh language; sharp words
Refers to speech that is severe, cutting, or critical, often used in contexts of conflict or strong disapproval.
彼は怒って険しい言葉を投げつけた。
He got angry and hurled harsh words.
険しい言葉で相手を傷つけてしまった。
I hurt the other person with sharp words.
Compound of 険しい (けわしい, 'steep, severe, harsh') and 言葉 (ことば, 'word, language'). The phrase is straightforward and its meaning is derived from the components.