uncoated

As adjectives the difference between uncoated and opaque

is that uncoated is not coated while opaque is neither reflecting nor emitting light.

As a noun opaque is

(obsolete|poetic) an area of darkness; a place or region with no light.

As a verb opaque is

to make, render (more) opaque.

As an adjective uncoated

is not coated.

As a verb uncrated is

(uncrate).

As adjectives the difference between uncosted and uncoated

is that uncosted is not costed while uncoated is not coated.

As adjectives the difference between uncoated and uncolted

is that uncoated is not coated while uncolted is (obsolete|nonce) unhorsed.