characterless

adjective2

1. •
   Having no distinguishing character or quality.

   • The House of All Sorts was new and characterless. It had not yet found itself—and an apartment house takes longer to find itself than do individual private houses. — 1944
2. •
   Lacking in or devoid of personality.

   • The letter within was written in the same straggling, characterless caligraphy, — I should have said, had I been asked offhand, that the whole thing was the composition of a servant girl. — 1897