Definify.com

Webster 1828 Edition

, a.

Not distinguished; not so marked as to be distinctly known from each other.

Undistinguish'd seeds of good and ill.

Not separately seen or descried.

Not plainly discerned.

Having no intervenient space.

Not marked by any particular property.

Not treated with any particular respect.

Not distinguished by any particular eminence.

undistinguished ‎(comparative more undistinguished, superlative most undistinguished)

Not distinguished.
- 2016 May 22, Phil McNulty, “Crystal Palace 1-2 Manchester United”, in BBC:
  All the messages in and around Wembley before and during this FA Cup final pointed to this Wembley showpiece marking the end of Van Gaal's largely undistinguished two-year spell in charge.