Etymology
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unobserved (adj.)

1610s, from un- (1) "not" + past participle of observe (v.).

updated on February 28, 2014

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Definitions of unobserved from WordNet

unobserved (adj.)
not seen or observed;
managed to slip away unobserved
Synonyms: unseen
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.