If you're walking on a crowded street and you stop suddenly — abruptly and without warning — somebody walking behind you may bump into you.

If you experience love at first sight, you've suddenly fallen in love. If you're driving at night and a deer jumps out in front of you, you might suddenly have to swerve to avoid it. Suddenly is the kind of adverb you might use a lot if you're describing the plot of an action movie, a mystery novel, or any story in which lots of unexpected things happen.

Definitions of suddenly

adv happening unexpectedly

suddenly she felt a sharp pain in her side”
all of a sudden, of a sudden

adv quickly and without warning

“he stopped suddenly
abruptly, dead, short

adv on impulse; without premeditation

“he made up his mind suddenly
on the spur of the moment

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