The term 'not up to par' is a phrase used to describe something that is not satisfactory or of an acceptable standard. It can be broken down into five crossword solutions: OFF (3 letters), ILL (3 letters), INFERIOR (8 letters), BELOWSTANDARD (13 letters), and UNDERTHEWEATHER (15 letters). These words all have similar meanings, with OFF meaning 'not working properly', ILL meaning 'not in good health', INFERIOR meaning 'of lower quality', BELOWSTANDARD meaning 'not meeting the required standards', and UNDERTHEWEATHER meaning 'not feeling well'. All of these words can be used to describe something that is not up to par.