adv
suddenly
SUHD-uhn-lee
adv
1
In a way that happens quickly and unexpectedly.
"Suddenly, the lights went out."
"He suddenly remembered he'd left the oven on."
How to Use Suddenly
Learner’s notesIn plain EnglishWithout warning; all at once.
Word Forms
more suddenly comparative, most suddenly superlative
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_____, the lights went out.
Etymology
From Middle English sodenly, built from sudden plus the adverb-forming suffix -ly.