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caustic

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caustic/ˈkɑːstɪk/adjective
caustic
/ˈkɑːstɪk/
adjective
Learner's definition of CAUSTIC  
[more caustic; most caustic]
: able to destroy or burn something by chemical action
: very harsh and critical

— caustically

/ˈkɑːstɪkli/adverb
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