Unability n. : Inability.

Example:
could a bad diet or not so great diet lead to nightmares and Unability to sleep?

Taxonomy
unability, Merriam-Webster Online Dictionary, Dictionary, webster, search, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, Google Search, Custom Search, glossary, english, language, ESL, Merriam, start your free trial, Unabridged Dictionary, Open Dictionary.

Defination from the web:
unability from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "unability" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: Link to this page: Cite this page: Products ...