An odd number can be described as a numerical value that is not evenly divisible by two. Some synonyms for an odd number include "uneven," "unpaired," "non-even," "peculiar," and "eccentric." Another alternative is "single," meaning a number that is not a multiple of two. Some other phrases that can be used to describe odd numbers might include "weird," "unusual," or "atypical." These terms all capture the idea that odd numbers are outside of the norm or represent something slightly different or off-kilter. Regardless of the exact phrasing used, the concept of odd numbers is an important one in mathematics and beyond.