She's not inexperienced in this field.
She has some experience in this field.
The cake is not bad.
The cake is pretty good.
You won't be sorry that you bought this car.
You will be happy that you bought this car.
Large crowds are not my favorite thing in the world.
I don't like large crowds.
He's not unlike his older brother.
He is similar to his older brother.
The exam was not overly easy.
The exam was pretty difficult.
The song is not without its catchy melody.
The song has a catchy melody.
I can't argue with you on that point.
I agree with you on that point.
The team's performance wasn't lacking in effort.
The team's performance showed effort.
The restaurant is not too far from here.
The restaurant is close to here.
The movie wasn't uninteresting.
The movie was pretty interesting.
He's not unaware of the situation.
He's aware of the situation.