Circumstantial

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late 16th century: from Latin circumstantia (see circumstance) + -al.

wiktionary

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From Latin circumstantia + English -al, equivalent to circumstance +‎ -ial.

etymonline

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circumstantial (adj.)

c. 1600, "attending, incidental," also "derived from circumstances," from Latin circumstantia (see circumstance) + -al (1). Related: Circumstantially. Legalese circumstantial evidence "evidence from more or less relevant circumstances bearing upon a case," as distinguished from direct testimony, is attested by 1691.