Burnt; occasionally burnished. Also as past participle.

burnished.

Made smooth (and usually glossy) by friction. Also figurative.

Made bright and shining as by friction, polished.

That has been thoroughly polished; perfectly smooth or glossy. Also (and in earliest use) figurative: highly refined or elegant; perfected.

Having a smooth shining surface, produced either by a coating substance or by friction, etc.; made glassy in appearance. Also (in Painting) of…

In various senses of the verb. Also with back, down.

Invested with a gloss, or bright appearance. Of the eyes: Glazed (obsolete).

Of a sword or its blade: burnished. Cf. brown, adj. 4. Obsolete.

That has, or is given, a bright, thick, or impressive gloss or sheen.

Thoroughly or highly polished; = perpolite, adj.

transferred. Presenting a shining or glossy appearance as if coated with varnish.

That has been made reflective; coated with a substance that reflects light, esp. as a road-safety measure.