In a way that relates to or depends on circumstances; based on detailed evidence or facts rather than direct proof.
From circumstantial + -ly adverbial suffix. Circumstantial comes from circumstance. The adverb form modifies verbs and adjectives to describe how something is circumstantial.
In the courtroom, 'circumstantially proven' means you've built a case from surrounding evidence, like showing opportunity, motive, and means—even without catching someone red-handed. Sherlock Holmes solves crimes circumstantially all the time.
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