Extrinsic; not essentially inherent; arising from an external source not the essence of the subject; not naturally, normally or historically associated with the subject or event
associated by chance and not an integral part; "poetry is something to which words are the accidental, not by any means the essential form"- Frederick W Robertson; "they had to decide whether his misconduct was adventitious or the result of a flaw in his character"
\ad-ven-TISH-uhs\, adjective: 1 Added extrinsically; not essentially inherent 2 (Biology) Out of the proper or usual place; as, "adventitious buds or roots "