different between darned vs undarned

English

darned

darned (comparative (rare) darneder or (rare) darnder, superlative darnedest or darndest)

(euphemistic) A minced oath for damned, used to express contempt, exasperation, consternation, etc. towards someone or something.
Those darned kids were round here again this morning.
The darned rope has got tangled up.

darned (not comparable)

(degree) Damned, extremely.
That was darned nice of him, wasn't it?
He is so darned pig-headed.

un- +? darned

undarned (not comparable)

Not darned.
- 1914, Charles Austin Beard, Readings in American government and politics
  […] the home would instantly be left a howling wilderness of cradles and a chaos of undarned stockings and buttonless shirts.

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