nondescript adj.

a prefix used freely in English and meaning "not, lack of," or "sham," giving a negative sense to any word, 14c., from Anglo-French noun-, from Old French non-, from Latin non "not, by no means, not at all, not a," from Old Latin noenum "not one" (*ne oinom, from PIE root *ne- "not" + PIE root *oi-no- "one, unique"). In some cases perhaps from Middle English non "not" (adj.), from Old English nan (see not). "It differs from un- in that it denotes mere negation or absence of the thing or quality, while un- often denotes the opposite of the thing or quality" [Century Dictionary].

mid-13c., descriven, "interpret, explain," a sense now obsolete; c. 1300, "represent orally or by writing," from Old French descrivre, descrire (13c.) and directly from Latin describere "to write down, copy; sketch, represent," from de "down" (see de-) + scribere "to write" (from PIE root *skribh- "to cut").

From late 14c. as "form or trace by motion;" c. 1400 as "delineate or mark the form or figure of, outline." Reconstructed with Latin spelling from c. 1450. Related: Described, describes, describing.