un designed (adjective) undesigned: unintentional
Sinonime: accidental,
aimless,
casual,
chance,
erratic,
extemporaneous,
fortuitous,
haphazard,
inadvertent, involuntary, purposeless,
random,
unconscious, undevised,
unexpected,
unforeseen, unintended, unmeant,
unplanned, unpremeditated, unthinking, unthought, unwitting