Below par can mean substandard, mediocre, inadequate, unsatisfactory, or deficient. These synonyms describe something that is not up to the expected or desired level of quality or performance. Other possible synonyms include lackluster, inferior, below average, non-competitive, lackadaisical, and half-hearted. Below par can also be expressed as "off-color" or "not up to scratch." Whether it pertains to a person's performance, a product's quality, or a team's efforts, being below par means falling short of expectations or failing to meet a particular standard. It's essential to strive for excellence rather than settling for anything that is below par.