"Clambered" is a verb that means to climb or move in an awkward and clumsy way. There are several other synonyms for this word that can be used interchangeably depending on the context of the sentence. For instance, "scrambled," "scaled," "climbed," and "drew oneself up" can all be used to mean "clambered." Other words such as "scraped," "clung," "crept," and "crawled" can also be used to imply a struggle or difficulty in the movement of the person. These synonyms can be used to add more meaning and context to any sentence where "clambered" might be used.