Sans tache.
ETYM Latin immaculatus; pref. im- not + maculatus, p. p. of maculare to spot, stane, from macula spot. Related to Mail armor.
1. Completely neat and clean; SYN. speckless, spick-and-span, spic-and-span, spic, spick, spotless.
2. Free from stain or blemish; SYN. undefiled.
Without a spot; especially, free from reproach or impurity; pure; untained; innocent