accidentally 12 Associations

by chance circumstantially unexpectedly deliberately (antonym)

unexpected 10 Associations

unannounced (similar term) unheralded (similar term) unpredicted (similar term) unanticipated (similar term) unforeseen (similar term) unlooked-for (similar term) out of the blue (similar term)

unexpected 10 Associations

forced unscheduled (similar term)

unexpected 10 Associations

unplanned (similar term)

unexpected 10 Associations

unforeseen sudden (similar term)

unexpectedly 12 Associations

out of the blue

unexpectedly 12 Associations

by chance accidentally circumstantially deliberately (antonym)