Synonym: accidental, chance, sudden, unforeseen. Antonym: usual. Similar words: expected, expect, selected, expert, expense, expertise, experiment, experience. Meaning: [‚ʌnɪk'spektɪd] 
adj. 1. not expected or anticipated 2. made necessary by an unexpected situation or emergency 3. not planned 4. happening or coming quickly and without warning.
adj. 1. not expected or anticipated 2. made necessary by an unexpected situation or emergency 3. not planned 4. happening or coming quickly and without warning. 
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1. The unexpected rainstorm caused the collapse of the roof.
2. They were brought up against unexpected delays.
3. The announcement was not entirely unexpected.
4. Something unexpected always breaks out in this area.
5. His departure was quite unexpected.
6. John came out with an unexpected shaft of wit/wisdom.
7. Her unexpected arrival threw us into total confusion.
8. She was detained in the office by unexpected callers.
9. The investigation yielded some unexpected results.
10. His death was totally unexpected.
11. Help came from a most unexpected quarter.
12. He is an unexpected guest to her.
13. The experiment produced some unexpected results.
14. The unexpected blow did not stagger his resolution.
15. The youngest player scored up an unexpected fifty runs.
16. This unexpected kindness touched her deeply.
17. Such beauty was unexpected in the midst of the city.
18. One unexpected spin-off of the course was the forming of some really close friendships.
19. To you unexpected persistence.
20. Any unexpected circumstance that arises may catalyze a sudden escalation of violence.
21. I'm afraid the unexpected accident may botch up the dinner tonight.
22. Always do something unexpected.
23. The assault was so unexpected that he was briefly stunned into submission.
24. An unexpected surge in electrical power caused the computer to crash.
25. John is stumped by an unexpected question.
26. His unexpected death is unexpected news.
27. She pushed him away with unexpected strength.
28. Things were working well when we were brought up against unexpected delays.
29. Life was suddenly full of possibilities,[sentencedict.com] not to mention a few unexpected surprises.
30. Her mother's death came as a great shock - it was so unexpected.
More similar words: expected, expect, selected, expert, expense, expertise, experiment, experience, experienced, expedition, experimental, at the expense of, aspect, suspect, spectrum, prospect, inspector, spectacle, introspect, perspective, inspection, spectacular, respectively, introspection, with respect to, irrespective of, tune, next, immune, tune in.