capable of burning, corroding, or destroying living tissue. severely critical or sarcastic: a caustic remark.

Is caustically a word?

Meaning of caustically in English

in a way that is hurtful, critical, or intentionally unkind: The longer the project dragged on, the more caustically his father condemned it.

Whats the definition of caustically?

1 : capable of destroying or eating away by chemical action : corrosive The chemical was so caustic that it ate through the pipe. 2 : marked by incisive sarcasm a caustic film review caustic humor. 3 : relating to or being the surface or curve of a caustic (see caustic entry 2 sense 2)