The term 'DESPAIR CRY OF' can be completed with three words: 'ALAS' (4 letters), 'AARGH' (5 letters), and 'SOB' (3 letters). 'ALAS' is an interjection used to express sorrow, regret, or grief. It is derived from the Old Norse word 'álas, ' which means 'UNFORTUNATE.' 'Aargh' is an exclamation of frustration, pain, or anger. It is thought to have originated in the 16th century as a variant of the word 'arggh, ' which was used to express dismay. 'SOB' is an onomatopoeic word used to describe a cry of sorrow or distress. It is believed to have originated in the late 16th century and is derived from the Middle English word 'sobb.'