Surah An-Nazi'at 79:8

قُلُوبٌ يَوْمَئِذٍ وَاجِفَةٌ

Hearts, that Day, will tremble,

Translation: Saheeh International

Tafsir

on that day hearts will be trembling frightened and anxious

Excerpt from Tafsir al-Jalalayn, commentary on 79:8, via Quran.com. The reader has the full commentary and 9 more tafsirs.