OPAQUE

Not allowing light to pass through

• Cloudy

• Dense

• Hard to grasp

• Hard to understand

• Hardly transparent

• Impossible to see through

• Light-blocking

• Light-rejecting

• Muddy

• Not at all clear

• Not clear

• Not easily understood

• Not translucent

• Not transparent

• Not transparent or translucent

• Obscure or dark

• Opposite of transparent

• Thickheaded

• Unclear

• Unfathomable

• Without luster