ك-ب-ر

Feminine: kabīra (كَبِيرَةٌ). Comparative: akbar (أَكْبَرُ) meaning 'bigger/biggest'. 'Allāhu Akbar' = God is Greatest.

أَكْبَرُ is the elative (comparative/superlative) form of كَبِيرٌ (great). It functions as a predicate in a nominal sentence. The verb form كَبَّرَ means 'to say Allāhu akbar.'

The takbīr is said at the start of every prayer, during the adhān (call to prayer), and on Eid celebrations. It is perhaps the most iconic Islamic phrase.

Masculine noun. Verb: تَكَبَّرَ / اسْتَكْبَرَ (to be arrogant). Active participle: مُسْتَكْبِرٌ (arrogant one). الْمُتَكَبِّرُ is a divine name (The Supreme).

Arrogance (kibr) is considered the root of all sin in Islam — it was Iblīs's (Satan's) sin when he refused to bow to Adam.