Example sentences:

Ramayana: Hanuman’s feat in single-handedly setting Ravana’s Lanka on fire boggled the minds of even the gods. 

 Mahabharata: When Bhima effortlessly uprooted a huge tree and whirled it overhead like a giant bludgeon, that sight boggled all observers.  

Bhagavad-gita: On beholding the universal form of Krishna, Arjuna’s mind was boggled, being filled first with amazement and then with fear.