Smart alecs are often described as being too clever or showing off their knowledge to the point of annoyance. Instead of using the term "smart alecs," there are several synonyms one can use to describe such behavior. For instance, the term "know-it-all" is commonly used to describe people who project excessive confidence in their knowledge. "Wiseacres" is another synonym for smart alecs, which means someone who is irritatingly clever and often speaks with sarcasm. Additionally, smart alecs can be referred to as "conceited," "cocky," or "arrogant," for their excessive self-confidence. Using these synonyms can be helpful in making one's writing or speech more descriptive and precise.