Meaning of (निश्चिंततापूर्वक) nishchintatapoorvak,nishchintatapurvak in english
As adverb :
nonchalantly Ex:  It also said What's done nonchalantly
Exampleनिश्चिंततापूर्वक का हिन्दी मे अर्थ
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(निश्चिंततापूर्वक) nishchintatapoorvak,nishchintatapurvak
can be used as verb or adverbNo of characters: 16 including consonants matras.
Transliteration :
nishchi.ntataapuurvaka