out of the blue 15 Associations

unanticipated unforeseen unlooked-for unexpected (similar term)

unannounced 11 Associations

unheralded unpredicted unexpected (similar term)

unanticipated 13 Associations

unforeseen unlooked-for out of the blue unexpected (similar term)

unforeseen 10 Associations

unanticipated unlooked-for out of the blue unexpected (similar term)

unheralded 10 Associations

unannounced unpredicted unexpected (similar term)

unhoped 7 Associations

unhoped-for unthought unthought-of unexpected (similar term)

unhoped-for 11 Associations

unhoped unthought unthought-of unexpected (similar term)

unlooked-for 12 Associations

unanticipated unforeseen out of the blue unexpected (similar term)

unplanned 9 Associations

accidental (similar term) casual (similar term) chance (similar term) ad hoc (similar term) casual (similar term) unexpected (similar term) unpremeditated (similar term)

unpredicted 11 Associations

unannounced unheralded unexpected (similar term)

unprovided for 14 Associations

unexpected (similar term)

unscheduled 11 Associations

extra (similar term) special (similar term) forced (similar term) unexpected (similar term) scheduled (antonym)

unthought 9 Associations

unhoped unhoped-for unthought-of unexpected (similar term)

unthought-of 12 Associations

unhoped unhoped-for unthought unexpected (similar term)

upset 5 Associations

unexpected (similar term)