There are a plethora of synonyms for the phrase "more suddenly" that can be used in writing to convey a sudden and unexpected action or movement. Some of the commonly used words include "abruptly," "instantaneously," "unexpectedly," "without warning," "swiftly," "abrupt," "rapidly," "in an instant," "immediately," "all of a sudden," "quickly," and "out of nowhere." These words can be used in different contexts, such as describing a sudden change of mood, a sudden turn of events, or an unexpected movement. Using synonyms for "more suddenly" adds variety to writing and creates a more interesting and engaging narrative or story.