unobserved

adj.

没有观察到的，无人遵守的；

1. It was easy for him to leave the house unobserved.
   他很容易从这座房子溜走而不被发现。
2. He found it is easy to leave the house unobserved.
   他发现很容易从这座房子溜走而不被发现。
3. Hardly ever did they manage to meet unobserved.
   他们几乎从不安排会面，却没有受到注意。

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Cyclical Productivity with Unobserved Input Variation
On some remarkable and hitherto unobserved phenomena of binocular vision.
Why Are the Beveridge-Nelson and Unobserved-Components Decompositions of GDP so Different?
Stalking Information: Bayesian Inventory Management with Unobserved Lost Sales
Programme Evaluation with Unobserved Heterogeneity and Selective Implementation: The Mexican PROGRESA Impact on Child Nutrition
The Inconsistency of Common Scale Estimators When Output Prices are Unobserved and Endogenous
Contributions to the physiology of vision.—Part II.—On some remarkable, and hitherto unobserved, phenomena of binocular vision. A ...