different between untainted vs unwemmed

English

un- +? tainted

untainted (comparative more untainted, superlative most untainted)

Not tainted; free of contamination; pure.
- The master of [the Bell public house] is brother to the great preacher Whitefield; but is absolutely untainted with the pernicious principles of Methodism, or of any other heretical sect.

From un- +? wemmed.

unwemmed (comparative more unwemmed, superlative most unwemmed)

(obsolete) untainted, pure
- c. 1387, Geoffrey Chaucer, "The Man of Law's Tale", Canterbury Tales
  Þe þeef fil over bord al sodeynly, / And in þe see he dreynte for vengeance; / And þus haþ Crist unwemmed kept Custance.

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