Synonyms of undesigned

2 Syllables
unmeant, random, aimless, casual, unthought, chance
3 Syllables
erratic, haphazard, unplanned, fortuitous, unwitting, unthinking, unconscious
4 Syllables
unintended, purposeless, aleatory, inadvertent, undevised, accidental, unexpected, unforeseen
5 Syllables
extemporaneous, unintentional, irreflective, involuntary
6 Syllables
unpremeditated