unvarnished

Not coated with varnish.

Stated or otherwise presented without any effort to soften or disguise; plain.

Not overlaid with varnish.

Not artfully embellished; plain.

Not having been coated with varnish (or other surface treatment).

Pure, natural, unmodified (especially in the phrase “unvarnished truth”).

free from any effort to soften to disguise

not having a coating of stain or varnish