unsifted

If you bake with unsifted flour you don't know how much you are using because it might be packed down or very fluffy.

1765, George Colman, The Comedies of Terence, Translated into Familiar Blank Verse, London: T. Becket & P. A. De Hondt, 2nd edition, 1768, Volume I, Preface, p. xxxii, But each man’s understanding, such as it is, must be his guide; and he, who has not courage to make a free use of it, but obtrudes the opinions of others, unsifted and unexamined, on his readers, betrays more want of respect for their understanding, than diffidence of his own.