1) (French) an accidental mistake in behaviour or speech that offends all people (faux pas)
2) an instance of accidental good luck (fluke)
happening by chance
chance, random
dependent on something that may or may not happen
conditional; possible
not belonging (to what is being dealt with); coming from outside
unneeded; irrelevant
happening without having been planned; depending on chances
without plan or organization
accompanying but not forming a necessary part; small and comparatively unimportant
related; minor
(of a number) not exactly divisible to two: '1, 3, 5 and 7 are odd numbers'; one of a pair when the other is missing; not regular, habitual or fixed; strange; peculiar
miscellaneous, various
without any particular reason
haphazard, chance
causing surprise
unexpected
not justified, desirable or necessary
unnecessary
surprising because not expected
surprising
unexpected (the usual word)
surprising
not intentional
not planned
unexpected (the usual word)
surprising
not intentional
unintentional
not necessary; that could have been avoided
not required
