"Come naught" is an obsolete phrase that means "to end in failure." This term is rarely used in modern times and has been replaced by synonyms such as "come to nought," "be in vain," or "fail." Antonyms for "come naught" would include phrases such as "succeed," "accomplish," "triumph," "succeed in," or "achieve." These words express positive outcomes and success, rather than the negative connotation associated with "come naught." It is important to use language that is relevant and modern, as antiquated expressions may not be understood and can cause confusion.