Not stained (synset 300403220)
"An apron keeps his clothing unstained"similar: untreated - (of a specimen for study under a microscope) not treated with a reagent or dye
Not having a coating of stain or varnish (synset 301718859)
similar: unpainted - not having a coat of paint or badly in need of a fresh coatsynonym: unvarnished
Without soil or spot or stain (synset 300420469)
similar: clean - free from dirt or impurities; or having clean habits
(of reputation) free from blemishes (synset 300248114)
"his unsullied name"; "an untarnished reputation"