Supernatural inflation is an attractive model based just on a flat direction with soft SUSY breaking mass terms in the framework of supersymmetry .
The beauty of the model is inferred from its name that the model needs no fine-tuning .
However , the prediction of the spectral index is n _ { s } ^ { > } { } _ { \sim } 1 , in contrast to experimental data .
In this paper , we show that the beauty of supernatural inflation with the spectral index reduced to n _ { s } = 0.96 without any fine-tuning , by considering the general feature that a flat direction is lifted by a non-renormalizable term with an A-term .