preconvict means to convict in advance. Lexicurio rates it Sui generis — a strength score of 100 out of 100.
Etymology
From pre- + convict.
verb
- To convict in advance.“[…] he was conscious to himself that he had prejudged, preconvicted, and even presentenced the Man whom he tried, months before he heard his case, as is demonstrated by his threat to Mrs. MILBANK "that he would send him into penal servitude!" […]”