WordNet 3.0
Noun (2)
- the quality of being sharp or harsh to the senses“the shrillness of her hair color”
- having the timbre of a loud high-pitched soundSynonyms: stridencestridency
Webster's Dictionary (GCIDE)
Shrillness \Shrill"ness\, n. The quality or state of being shrill. [1913 Webster]