nondescript

Etymology

From non- + descript.

adj

1. (biology, now rare) Not described (in the academic literature).
2. Without distinguishing qualities or characteristics.
   He drove a nondescript silver sedan.
   There was, besides, a Scots mason, known from his favourite dish as "Irish Stew," three or four nondescript Scots, a fine young Irishman, O'Reilly, and a pair of young men who deserve a special word of condemnation. 1895, Robert Louis Stevenson, “//dummy.host/index.php?title=s%3Aen%3AThe+Amateur+Emigrant%2FThe+Second+Cabin The Second Cabin”, in The Amateur Emigrant
   We open in a grimy, fluorescent-lit military base somewhere in rural England, where the girl from the poster, Melanie (Sennia Nanua), is the star student in a class full of children who are wheeled into school—or at least, the nondescript concrete room that serves as a school—with their arms, legs, and foreheads bound to their wheelchairs by leather straps. February 23, 2017, Katie Rife, “The Girl With All The Gifts tries to put a fresh spin on overripe zombie clichés”, in The Onion AV Club
   The plaque, of light-blue hue (a tone favoured by the Wiltshire market town's civic society), can be found on a nondescript structure just outside the station. December 29 2021, Stephen Roberts, “Stories and facts behind railway plaques: Chippenham (1841)”, in RAIL, number 947, page 57

noun

1. (chiefly biology) A species or other type of creature that has not been previously described or identified.
   Imagination has given figure and character to centaurs, satyrs, and down to all the fairy tribe; but titles baffle even the powers of fancy, and are a chimerical non-descript. 1791, Thomas Paine, Rights of Man
2. An undistinguished, unexceptional person or thing.
3. (UK) An unmarked police car.
   By a nice British compromise, the enforcement car — visible just then as a white spot on the television screen — has nothing externally to show its police affiliation, but unlike the CID's nondescripts, carries two large policemen in uniform. 1970, Peter Laurie, Scotland Yard: a study of the Metropolitan Police, page 118