nondescript
nondescript , adjective
[Prefix non- + Latin descriptus described.]
1.
Not hitherto described;
of no recognizable type or class; odd; abnormal; unclassifiable.
2.
Dull or uninteresting; undistinguished.
Nondescript , noun
A thing not yet described; that of which no account or explanation has been given; something abnormal, or hardly classifiable.