The phrase "ants pants" is a slang term that refers to someone who is considered to be outstanding or exceptional. However, when it comes to antonyms for this phrase, we may consider words that describe the opposite, such as mediocre, ordinary, or unremarkable. If someone is not the "ants pants," they may be considered average or below average in their abilities. They may lack the skills, knowledge, or experience required to excel in their field. Therefore, the opposite of the "ants pants" may be someone who is forgettable or unimpressive rather than someone who stands out in a negative way.