The state or quality of being childish; immaturity.

बालपन; अपरिपक्वता

English Usage: His puerility was evident in his reluctance to face adult responsibilities.

Hindi Usage: उसकी अपरिपक्वता वयस्क जिम्मेदारियों का सामना करने के लिए उसकी झिझक में स्पष्ट थी।