accidental
causeless
fortuitous
inadvertent
uncaused
unintentional
unplanned
unwitting
adverse
calamitous
cardiovascular
catastrophic
deleterious
devastate
direful
extrapyramidal
incalculable
incidental
irreparable
mordant
neurological
unanticipated
unavoidable
undesirable
undesired
untoward
unwanted
amended
appended
befriended
bended
blended
commended
comprehended
contended
defended
depended
descended
distended
ended
expended
extended
fended
intended
mended
offended
pretended
recommended
reoffended
splendid
suspended
tended
transcended
trended
unamended
unattended