The phrase "let alone" is used to emphasize that the second action or item is even more improbable or difficult than the first. Alternatives to "let alone" include "much less," "not to mention," "far from," "aside from," "never mind," "not even," "least of all," and "not considering." These synonyms permit the user to modify the degree of contrast between the two items or actions being mentioned. The use of synonyms allows writers to avoid repetition and vary their language, making their writing more engaging. Always choose the proper synonym, depending on the context in which it is used, as each one modifies the meaning of the sentence in its way.