Not intending to be so; unwitting:
Not done on purpose
Having no particular purpose, organization, or structure; random.
Not intended; unintentional
Find another word for undevised. In this page you can discover 8 synonyms, antonyms, idiomatic expressions, and related words for undevised, like: inadvertent, undesigned, unintended, unintentional, unmeant, unplanned, unwitting and planned.