LATIN DICTIONARYLexicon Latīnum
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“imperfection” in Latin

The English word imperfection itself goes back to Latin perficiō, through imperfectio.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

imperfection
imbecillitas: vitiositas: *conditio vitiosa or manca: vitium (defect).

Quick answer

What is the Latin word for imperfection?
The usual Latin words for “imperfection” are imbēcillitās, vitiōsitās, mancus; also vitium. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.