'Causticily' definitions:

Definition of 'Causticily'

From: GCIDE

Causticily \Caus*tic"i*ly\, n.
1. The quality of being caustic; corrosiveness; as, the causticity of potash. [1913 Webster]
2. Severity of language; sarcasm; as, the causticity of a reply or remark. [1913 Webster]