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imperfectible

[im-per-fek-tuh-buh l]
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adjective
  1. that cannot be perfected.

Origin of imperfectible

First recorded in 1865–70; im-2 + perfectible
Related formsim·per·fect·i·bil·i·ty, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018