The term "am short of" is often used to describe a lack or shortage of something. Antonyms for this phrase could include "abundance," "plenty," "surplus," "excess," or "ample." These terms suggest an abundance or surplus of something, rather than a shortage or deficiency. For example, if someone says "I am short of money," an antonym might be "I have an abundance of wealth." Using antonyms can help to convey a different tone or feeling in writing or speech, highlighting the availability or abundance of resources or opportunities instead of focusing on what is lacking.