checked

[chekt]
adjective
1.
having a pattern of squares; checkered: a checked shirt.
2.
Phonetics. (of a vowel) situated in a closed syllable (opposed to free ).

Origin:
1375–1425; late Middle English. See check1, -ed2

unchecked, adjective
well-checked, adjective
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World English Dictionary
checked (tʃɛkt)
 
adj
1.  having a pattern of small squares
2.  phonetics (of a syllable) ending in a consonant

unchecked (ʌnˈtʃɛkt)
 
adj
1.  not prevented from continuing or growing: unchecked population growth
2.  not examined or inspected
 
adv
3.  without being stopped or hindered: the virus could spread unchecked
4.  without being examined or inspected: our luggage passed unchecked through customs

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

unchecked
1469, from un- (1) "not" + pp. of check (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for unchecked
A white cell that is part of only one entry is called unchecked, unkeyed or uncrossed.
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