Definitions:

1. a rarified quality noun
   • the tenuity of the upper atmosphere
2. relatively small dimension through an object as opposed to its length or width noun
   • the tenuity of a hair
3. the quality of lacking intensity or substance noun
   • a shrill yet sweet tenuity of voice Nathaniel Hawthorne

Synonyms:

• feebleness
• rarity
• thinness