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Explanation: I think the word 'Pennu' can be used for word 'girl'and it doesn't have the exact meaning of word 'Darling'which has a more depth in meaning than mere girl.(the word darling shows a more intimate feeling of a lover).And also if using word Pennu , it should be as 'njaan ninne premikkunnu penne'(not 'pennu').In my opinion,(since Iam a native speaker of malayalam)Priyathama/ priyathame should be the right word for darling.Rest is left to you.