Tending to convict or prove guilty; serving to establish guilt; convincing as evidence.
From 'convict' plus the suffix '-ive' (tending to). This adjective describes something that has the power or effect of convicting someone of a crime.
Something 'convictive' is basically a legal term for 'damning evidence'—it's the kind of testimony or proof that makes a judge or jury think 'that person definitely did it!'
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