adj.not accessible to direct observation

Signaling Unobservable Product Quality through a Brand Ally
The Demand for Unobservable and Other Nonpositional Goods
Game-Playing Agents: Unobservable Contracts as Precommitments
Game-Playing Agents: Unobservable Contracts as Precommitments
Transparency and Credibility: Monetary Policy With Unobservable Goals
Evaluating structural equation models with unobservable and measuremenr error
Evaluating structural equation models with unobservable variables and measurement error: A comment.
ESTIMATING STATE‐TRANSITION PROBABILITIES FOR UNOBSERVABLE STATES USING CAPTURE–RECAPTURE/RESIGHTING DATA
Evaluating Structural Equation Models With Unobservable Variables and Meas Error: A Comment, in: Journal of Marketing Research
The Analysis of Systems of Qualitative Variables When Some of the Variables Are Unobservable. Part I-A Modified Latent Structure App...