The term 'OPPOSITE OF 58-ACROSS' is answered by two crossword solutions, 'NEVERMORE' (9 letters) and 'MISSINGINACTION' (15 letters). 'NEVERMORE' is a phrase that originated from the poem 'The Raven' by Edgar Allan Poe. It is used to express finality or an absolute refusal. 'Missinginaction' is a military term used to describe a soldier who is unaccounted for after a battle. It is the opposite of 'NEVERMORE' in that it implies a hope that the soldier will eventually be found.