nondescript

Lacking distinctive qualities; having no individual character or form.

Not hitherto described or classed.

Not easily described; abnormal or amorphous: of no particular kind; odd; unclassifiable; indescribable.

Anything that has not been described.

A person or thing not easily described or classed: usually applied disparagingly.

Not hitherto described

Dull or uninteresting; undistinguished.

A thing not yet described; that of which no account or explanation has been given; something abnormal, or hardly classifiable.

Not described (in the academic literature); undescribed, unidentified.

Without distinguishing qualities or characteristics; unexceptional.