There are several synonyms for the phrase "the complete amount." Some common alternatives include "the full amount," "the total sum," "the entire quantity," "the whole number," and "the overall figure." These synonyms can be used interchangeably to describe the entirety of a given quantity or sum. For example, one might say "the full amount due is $500" or "the total sum of the inventory is 500 units." These synonyms are useful for adding variety to one's language and for expressing the same idea in different ways. Depending on the context, one synonym may be more appropriate than another.