opaque
UK: əʊˈpeɪk | US: oʊˈpeɪk
adj. not transparent or translucent; impossible to see through
adj. hard to understand; obscure or unclear
The word "opaque" traces back to the Latin opacus, meaning "shaded, dark, or obscure." It entered Middle French as opaque, retaining the sense of darkness or lack of light. The modern English form preserves the original Latin root while adopting the French adjectival suffix. The term evolved metaphorically to describe anything intellectually unclear, mirroring its literal meaning of blocking light.
The bathroom window was made of opaque glass for privacy.
Her explanation of the theory remained opaque to most students.
The artist used opaque paints to create bold, solid colors.
Financial reports are often opaque to non-experts.
The fog grew so opaque that drivers could barely see ahead.