Proverbs 15:1 New English Translation

15 A gentle response^[a] turns away anger,
but a harsh word^[b] stirs up wrath.^[c]

Proverbs 15:1 tn Heb “soft answer.” The adjective רַךְ (rakh, “soft; tender; gentle”; BDB 940 s.v.) is more than a mild response; it is conciliatory, an answer that restores good temper and reasonableness (W. McKane, Proverbs [OTL], 477). Gideon illustrates this kind of answer (Judg 8:1-3) that brings peace.
Proverbs 15:1 tn Heb “word of harshness”; KJV “grievous words.” The noun עֶצֶב (ʿetsev, “pain, hurt”) functions as an attributive genitive. The term עֶצֶב refers to something that causes pain (BDB 780 s.v. I עֶצֶב). For example, Jephthah’s harsh answer led to war (Judg 12:1-6).
Proverbs 15:1 tn Heb “raises anger.” A common response to painful words is to let one’s temper flare up.

New English Translation (NET)