adj
unannounced
adj
1
Happening or arriving without prior notice.
"Her in-laws showed up unannounced on a Sunday morning."
How to Use Unannounced
Learner’s notesIn plain EnglishWithout warning beforehand.
Common pairings
arrive unannounced
an unannounced visit
unannounced inspection
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Her in-laws showed up _____ on a Sunday morning.