opaque

vaikeaselkoinen

läpinäkymätön, läpikuultamaton Neither reflecting nor emitting light.
Allowing little light to pass through, not translucent or transparent.
puhekieltä unclear Unclear, unintelligible, hard to get or explain the meaning of
puhekieltä obtuse Obtuse, stupid.
puhekieltä Describes a type for which higher-level callers have no knowledge of data values or their representations; all operations are carried out by the type's defined abstract operators.
puhekieltä An area of darkness; a place or region with no light.
1745, Edward Young, Night-Thoughts, I:

Through this opaque of Nature and of Soul, / This double night, transmit one pitying ray, / To lighten, and to cheer.