nondescript

Concise Oxford English Dictionary © 2008 Oxford University Press:
nondescript /ˈnɒndɪskrɪpt/

▶adjective lacking distinctive or interesting characteristics. ▶noun a nondescript person or thing.

– derivatives
nondescriptly adverb,
nondescriptness noun.

– origin C17 (in the sense ‘not previously described scientifically’): from non- + obs. descript ‘described, engraved’.