Stumblingly is an adverb used to describe someone who is faltering or unsteady in their movements or speech. There are several synonyms for this word such as clumsily, awkwardly, hesitantly, falteringly, uncertainly, tentatively, unsteadily, and haltingly. These words suggest a lack of confidence or skill, and a need for support or assistance. Each of these terms can be used interchangeably with stumblingly, but their nuances may be different depending on the context. For instance, "haltingly" implies a stop-start movement or speech, while "hesitantly" suggests a reluctance to move or speak. In any case, using synonyms adds variety and interest to writing or speech.