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.
He's not unaware of the situation.
He's aware of the situation.
The movie wasn't uninteresting.
The movie was pretty interesting.
She's not inexperienced in this field.
She has some experience in this field.
The cake is not bad.
The cake is pretty good.
He's not unlike his older brother.
He is similar to his older brother.
I can't argue with you on that point.
I agree with you on that point.
The song is not without its catchy melody.
The song has a catchy melody.
The exam was not overly easy.
The exam was pretty difficult.
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.