Definitions for unstained
Random House Webster's College Dictionary
"An apron keeps his clothing unstained"
not having a coating of stain or varnish
unsoiled, unspotted, unstained(adj)
without soil or spot or stain
stainless, unstained, unsullied, untainted, untarnished(adj)
(of reputation) free from blemishes
"his unsullied name"; "an untarnished reputation"
Not dyed or discolored.
The unstained hardwood floor was pale, but the finish soaked in and made the room seem dark.
Pure, pristine, clean, immaculate, unadulterated.
She arrived at the chapel for her marriage with unstained honor.