Nyilasy was born in Szeged, on the date of 1873.12.02. Apart from the time of his studies in foreign countries and the two summers spent in Nagybánya, he lived and worked in Szeged. He died there in 1934. 01.06.

He was a student of Hollósy in Munich and Paris at the Julian Academy in 1894 and 1895. This is where János Thorma met him in the spring of 1897, and seeing his studies, invited him to Nagybánya. Nyilasy was a disciple of Hollósy at the beginning, then he began to plan and paint his first painting. It was exhibited with the title Bethlehem at the first exhibition of the Nagybánya School in Budapest. The vision of Bethlehem showed the influence of Rembrandt, only its tones were colder. The little body of the holy child irradiated light from the centre of the painting into the darkness of the stable and all that surrounded him. His vision was beautiful but alien to Nagybánya. He painted one bigger canvas, the Evening toll and three smaller landscapes. These were born under the influence of Nagybánya. His fresh, lively colours, the decorativity of his view of nature show the influence of Ferenczy's painterly views. It was Ferenczy, who had the most influence on him from the early beginning, which could be observed even when the school of Nagybánya fell apart. Returning to Szeged, Nyilasy evolved his art in a way that suited his personality and his surroundings. It was interesting that Hollósy had no ethical or artistic influence on him, in spite of the long time that he spent in his school.

Nyilasy exhibited ten paintings at the first group exhibition of the Nagybánya school. The majority of them were painted in Nagybánya. In the next year, in 1899, he left Nagybánya and his pictures were sent in from Szeged. He exhibited five pictures that year. He took part with one single picture in the last group exhibition in the second year. The works painted in Szeged began to have a different character, than the ones painted in Nagybánya: a different air, different colours, a different human environment, a different landscape and even a different human character was reflected by them.

Eight paintings belonging to his oeuvre got to the former Museum of Fine Arts. They are exhibited at the Hungarian National Gallery today. His other works are preserved in private collections.