Acerbic

əˈsərbɪk

adjective

Sharp, biting or harsh in tone, especially in speech, wit or laughter.

Acerbic describes the sting of an expression or manner. It does not always mean funny: a cutting remark can be acerbic even when its target does not find it amusing.

See how George R. R. Martin, Stephen King and 1 other author use "acerbic", with its meaning, pronunciation and real book examples.