Noah Webster's Dictionary (n.) The quality or condition of being imperfect; want of perfection; incompleteness; deficiency; fault or blemish.

Multi-Version Concordance Imperfection (2 Occurrences) Hebrews 8:7 For if that first Covenant had been free from imperfection, there would have been no attempt to introduce another. (WEY) Revelation 3:2 Rouse yourself and keep awake, and strengthen those things which remain but have well-nigh perished; for I have found no doings of yours free from imperfection in the sight of My God. (WEY)