B1noun
خُشُوعٌ
khushūʿ
humility / reverence / awe (in worship)
Example
قَدْ أَفْلَحَ الْمُؤْمِنُونَ الَّذِينَ هُمْ فِي صَلَاتِهِمْ خَاشِعُونَ
qad aflaḥa al-muʾminūna alladhīna hum fī ṣalātihim khāshiʿūn
Certainly the believers have succeeded - those who are humbly reverent during their prayer (23:1-2)
Grammar
Masculine verbal noun (maṣdar) of خَشَعَ (to be humble/reverent). Related: خَاشِعٌ (humble/reverent), خُشُوعٌ (humility). Differs from خَوْفٌ (fear) - khushūʿ combines awe, love, and humility.
Culture
Khushūʿ is considered the soul of prayer. Without inner humility and focus, prayer becomes mere physical movements. It is the first quality of successful believers mentioned in Surah Al-Muʾminūn.