deliberate:
accidental,
unintentional,
unwilling,
unplanned,
involuntary.
noun:
compulsory,
impulsive,
necessary,
forced,
abrupt,
ordered,
haphazard,
extemporaneous,
desultory,
unintended,
purposeless,
sudden,
hit-or-miss,
random,
unforced,
required,
mandatory,
obligatory,
impetuous,
nonelective,
aimless.