Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not bearing an identifying mark: an unmarked police car; unmarked merchandise.
  • adj. Not observed or noticed.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. not bearing identification
  • adj. free from blemishes
  • adj. not noticed
  • adj. not marked, not closely followed by a defender

from The Century Dictionary and Cyclopedia

  • Not marked; having no mark: as, the unmarked (south-pointing) pole of a magnet.
  • Unobserved; not regarded; undistinguished; not noted.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. not taken into account
  • adj. not having an identifying mark

Etymologies

un- +‎ marked (Wiktionary)

Examples

  • This was a blind test, with two groups of tasters sampling beer in unmarked cups.

    Taste Test: Pumpkin beers

  • His sons died prematurely and are buried in unmarked Sonoma County graves.

    Ambrose Bierce (1842-1913?)

  • Not that other DC agencies, the courts, or police are much better — ped rights in unmarked crosswalks are ignored on all sides, there are few (if any) arrests for failure to stop and give right of way, no matter how aggressive the drivers involved have been.

    Matthew Yglesias » DDOT Decides That Speedy Cars are More Important than Pedestrian Safety

  • Their captors would have killed the Ameri-cans when they tired of them, Cayton said, leaving their bodies in unmarked jungle graves except for a fortuitous break.

    Command SgtMaj Rick CAYTON

  • Not talking about things is a privilege granted to those in unmarked categories.

    Silence is complicity. « A Bird’s Nest

  • They organized private meetings, clandestine flights and ferried documents in unmarked three-ring binders.

    A Quiet Obama Puppeteer - The Caucus Blog - NYTimes.com

  • Police officers could be seen sitting in unmarked cars, blocking off the residential street, where a growing crowd of observers gathered in front and across the street from the blue house with green columns, straining to get a glimpse of what was happening.

    amerikan nazism : you’re lovin’ it

  • A 17 year old grocery bagger, Moisei Baraniuc, a Ukrainian immigrant, found $10,000 in unmarked cash in the bathroom of the grocery store where he works.

    Interesting Articles

  • The detectives assigned to hunt for witnesses go after their targets with the same zeal and using the same tactics that other homicide detectives use to pursue murder suspects — they ride in unmarked vehicles, stake out locations, search houses, interrogate friends and relatives, and even pay informants.

    On Baltimore's Mean Streets

  • The sort of moral persuasion that has such doctors working in unmarked buildings that have extensive internal and external video surveillance, as well as buzz in and out of patients, who are shuttled to and from the clinic to avoid their personal cars from being ID'd.

    Balkinization

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