What is a synonym for 'myriad'?

The term 'myriad' refers to a large, indefinite number, often implying that there are countless possibilities or a vast array of options. When considering a synonym, 'countless' captures this essence perfectly, as it conveys the idea of an innumerable quantity. The other options do not align with the meaning of 'myriad'; for instance, 'few' and 'limited' suggest a small number, while 'specific' refers to something that is clearly defined or identified, which is the opposite of the broad and extensive nature implied by 'myriad'. Thus, 'countless' is the most accurate synonym in this context.