"Most off form" is a phrase that conveys someone who is performing poorly or is experiencing a decline in success. Synonyms for this phrase include "struggling," "underperforming," "out of stride," "off their game," "below par," "inefficient," "not up to scratch," "below standard," "unsuccessful," and "in decline." It is important to note that these synonyms can be used depending on the context and the nature of the activity or situation in which the person is struggling. Regardless of which term is used, it is clear that the individual is not performing as well as they have in the past.