Acerb a. : Sour, bitter, and harsh to the taste, as unripe fruit; sharp and harsh.

Example:
Why is it an unpleasant sound for some when a fork rubs a plate?

Taxonomy
acerb, Merriam-Webster Online Dictionary, Latin, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, glossary, english, language, ESL, Search, rb, adjective, Etymology, acerbe, acerbus.

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