unmarked

[uhn-mahrkt]
adjective
1.
not marked.
2.
Linguistics.
a.
characterized by the absence of a distinctive phonological feature, as (p), which, in contrast to (b), lacks the distinctive feature of voicing.
b.
characterized by the absence of a grammatical marker, as the singular in English in contrast to the plural, which is typically marked by an -s ending.
c.
neutral with regard to an element of meaning specified by a semantically related item.
d.
occurring more typically than an alternative form. Compare marked ( def 4 ).

Origin:
1400–50; late Middle English; see un-1, marked

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World English Dictionary
unmarked (ʌnˈmɑːkt)
 
adj
1.  not carrying a mark or marks: an unmarked police car
2.  not noticed or observed

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

unmarked
c.1400, "having been given no mark," from un- (1) "not" + pp. of mark (v.). Cf. O.N. umarkaðr. Meaning "not noticed or observed" is recorded from 1533.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Take a food item-a couple of carrots, for example-and put one in an unmarked
  bag.
They lull students and others into a false sense of security, leaving homonyms
  or near homonyms of the intended word unmarked.
We are mailing this rejection in a plain unmarked envelope with no return
  address.
He was buried in an unmarked grave on the hospital grounds.
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