Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “caustic”

caustic

adjective uk   /ˈkɔː.stɪk/ us    /ˈkɑː-/

caustic adjective (CHEMICAL)

describes a chemical that burns or destroys things, especially anything made of living cells: a caustic substance

caustic adjective (WORDS)

describes a remark or way of speaking that is hurtful, critical, or intentionally unkind: caustic comments She's famous in the office for her caustic wit.
caustically
adverb uk   /ˈkɔː.stɪ.kəl.i/ us    /ˈkɑː-/
(Definition of caustic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of caustic?
Browse related topics

You are looking at an entry to do with Unkind, cruel & unfeeling, but you might be interested in these topics from the Kind and unkind topic area:

Add Cambridge dictionaries to your browser to your website

More meanings of “caustic”

Definitions of “caustic” in other dictionaries

Word of the Day

for starters

used to say that something is the first in a list of things

Word of the Day

Come on – you can do it! Phrasal verbs with ‘come’.

by Liz Walter​,
November 19, 2014
As part of an occasional series on the tricky subject of phrasal verbs, this blog looks at ones formed with the verb ‘come’. If you are reading this blog, I’m sure you already know come from, as it is one of the first things you learn in class: I come from Scotland/Spain.

Read More 

ped-text verb

November 24, 2014
to text someone while walking I’m ped-texting, I’m looking down at my phone, 75 percent of the time.

Read More