Niezabitowski was born in Leżajsk as a member of the families of Walerian and Jadwiga née Przybylska.

[8] On September 29, 1936, he became the chief of staff of the State Air Defense Inspector, Brigadier General Józef Zając.

On September 12, during the Battle of the Bzura, he again took command of the 4th Infantry Division after the fallen colonel Rawicz-Mysłowski.

After the fights ended, he was in German captivity, including in the Oflag VII-A Murnau.

In the spring of 1945, he received a negative opinion from Maj. Gen. Juliusz Rómmel, who stated that Colonel Niezabitowski was "a fantastic unfit for the line, he could ultimately work in the military and office space.