different between unflinching vs unshrinking

English

un- +? flinching

unflinching (not comparable)

Without flinching; staying committed despite any difficulty; steadfast.
- 1837, Catharine E. Beecher, An Essay on Slavery and Abolitionism, page 126
  Can an honest, upright and Christian man, go into these conflicts, and with unflinching firmness stand up for all that is good, and oppose all that is evil, in whatever party it may be found, without a measure of moral courage such as few can command?

un- +? shrinking

unshrinking (comparative more unshrinking, superlative most unshrinking)

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