IPA: /kɔːˈstɪsɪti/
KK: /kɔːˈstɪsɪti/
The quality of being able to burn or corrode organic tissue by chemical action; sharpness or bitterness in speech or writing.
The causticity of his remarks left the audience in shock.
Causticity is formed from "caustic" (from Greek "kaustikos", meaning able to burn) and the suffix "-ity" (meaning the state or quality of). The word refers to the quality of being caustic or having the ability to burn or corrode.
Think of something that has the 'ability to burn' ('caustic') and the '-ity' that indicates a state or quality. This helps you remember that causticity refers to the quality of being able to burn.