The term 'APOGEE's Antithesis' refers to the OPPOSITE of APOGEE, which is NADIR. NADIR is a five-letter word meaning the lowest point in a particular situation or cycle. It is derived from the Arabic word 'nazir, ' which means 'OPPOSITE.' In astronomy, NADIR is the point on the celestial sphere directly below an observer. In other contexts, it can refer to the lowest point of anything, such as a person's morale or a company's stock price.