not proven
Webster's Dictionary (GCIDE)
Proven \Prov"en\, p. p. or a. Proved. "Accusations firmly proven in his mind." --Thackeray. [1913 Webster]
Of this which was the principal charge, and was generally believed to beproven, he was acquitted. --Jowett (Thucyd. ). [1913 Webster]
Not proven (Scots Law), a verdict of a jury that the guilt of the accused is not made out, though not disproved. --Mozley & W. [1913 Webster]