Not distinguished: not marked by conspicuous qualities. / Not distinguished: not having an air of distinction.

Imperceptible; indistinct. / Indistinguishable.

indistinguishability

Failing to distinguish; undiscerning.

In a way that cannot be distinguished.

(rare) The quality of being undistinguishable; indistinguishability, indistinctness.

Quality of being undistinguished; lack of distinction.

In an undistinguished manner; without distinction.