Learner's definition of RIGHTLY
1 : in a way that is correct
If I remember rightly, today is his birthday.
She rightly anticipated a decline in the value of the stock.
He points out, quite rightly, that there are flaws in the theory.
Many people, rightly or wrongly, believe the economy will soon improve.
2 : for a good reason: in a way that is proper or appropriate
She rightly admires his paintings.
People are rightly upset about the city's rising crime rate.
Quite rightly, the police commissioner is being blamed for the city's rising crime rate.
She is proud of her children, and rightly so.
3 informal : with certainty: for sure— usually used in negative statements