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Definition of unexpected : Not expected; coming without warning; sudden.

Synonyms:

past conjecture, unplanned, not bargained for, coming unaware, out of the blue, accidental, prodigious, unhoped-for, unpredicted, staggering, unhoped, unscheduled, unprepared for, stunning, unannounced, eye-opening, uncontemplated, wonderful, upset, unprovided for, amazing, not on the books, coming without previous intimation, forced, unlooked-for, unthought, like a bolt from the blue, electrifying, unthought-of, unsuspected, not in the cards, unheralded, fortuitous

immediate, instantaneous, hasty, abrupt, precipitous, sudden, quick

shocking, startling, astounding, astonishing, surprising, unforeseen, unanticipated

Usage examples:

• Sort of unexpected, wasn't it, Bill? - "The Coming of the Law", Charles Alden Seltzer.
• My sudden and unexpected appearance had frightened her. - "Kent Knowles: Quahaug", Joseph C. Lincoln.
• I must confess that I was struck with horror at the sudden approach of a death so new, so dreadful, so unexpected! - "The History of Sandford and Merton", Thomas Day.