The word "doggonest" is mainly used to express surprise or frustration. However, there are several synonyms that can be used in its place. Some popular synonyms include "darnedest," "gol-darnedest," "heckin'," and "blasted." These words can be used interchangeably with "doggonest," depending on the context and level of formality. Other options include "durnedest," "confounded," and "flippin'." Each of these words has its own unique connotation and can be used to convey a range of emotions. Whether you're expressing annoyance or amazement, there's a synonym for "doggonest" that can help you get your point across.