Example Sentences:

Ramayana: When the alarmed Dasharatha objected that Rama was a callow youth incapable of fighting mighty demons, Vashishtha reminded him that Rama was actually Vishnu incarnate.

Mahabharata: After Bhima went through the experience of being poisoned by Duryodhana and surviving miraculously, the powerful Pandava evolved from a callow teenager to a shrewd youth.

Bhagavad-gita: Those who keep doing whatever their mind impels them to do remain callow, no matter how old they grow.