immaturely

In a sentence

They may be approaching 40, but after three beers they are behaving as immaturely as any teenager.

उनीहरू ४० वर्षतिर पुग्दै होलान्, तर तीन बियरपछि उनीहरू कुनै किशोरझैँ बालजस्तो गरी व्यवहार गर्छन्।