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Synonyms for Immaculate (same or very similar meaning)

WordNet sense 1 (free from stain or blemish):
undefiled

WordNet sense 2 ((used of persons or behaviors) having no faults; sinless):
pure

WordNet sense 3 (without fault or error):
faultless, impeccable

WordNet sense 4 (being complete of its kind and without defect or blemish):
perfect, perfect

WordNet sense 5 (completely neat and clean):
spick-and-span, spotless, speckless, spic-and-span, spick

WordNet sense 6 (free from dirt or impurities; or having clean habits):
clean


From the ODE community, based on WordNetadd/edit