"Dumbos" is a term that has often been used to describe someone who is not intelligent or has a lack of common sense. However, there are many other synonyms that can be used to describe such a person. Some of the common alternatives include "fool," "idiot," "simpleton," "moron," "dolt," "witless," "numbskull," and "dim-witted." Each of these synonyms portrays the same meaning but some are more or less harsh than others. It is always important to use appropriate language when describing or referring to someone's intelligence.