Simple এর noun form হচ্ছে Simplicity. Simplicity [সিম্প্লিসাটি] (noun) [uncountable noun]: • English Meaning: the state of being simple, uncomplicated, or uncompounded. • Bengali Meaning: সহজতা; সারল্য। Example sentence: He spoke with admirable simplicity.
Source: Merriam-Webster Dictionary, Accessible Dictionary by Bangla Academy.