A word puzzled me earlier, while I was trying to write the first three sentences of a new work. ‘Thine heart is the essence of humanity,’ read the text. John sighed. Another murder to remain unsolved. The opposite of solvable is spelled how exactly? I couldn't find the correct spelling of it in MS Word nor in a dictionary/theasaurus. What I wanted to say was: ‘Thine heart is the essence of humanity,' read the text. John sighed. Another murder, another unsolvable one. (I know there could be an e in there however after the v. But the processor didn't accept either version.) I know the other variation it could be is insolvable. Anyway, I'm a bit perplexed. Google isn't much help either and I'll probably settle on the first example now, but still, I'm just curious.