unexpectedly

Từ điển WordNet v3.1 - WordNet Dictionary

adverb

1. in a way that was not expected (Freq. 5)
- her brother showed up at the wedding out of the blue
• Syn:
out of the blue
• Derived from adjective:
unexpected
2. without advance planning (Freq. 2)
- they met accidentally
• Syn:
by chance, accidentally, circumstantially
• Ant:
deliberately (for: accidentally)
• Derived from adjective:
unexpected