Definition of mordant adjective from the Oxford Advanced Learner's Dictionary

 

mordant

 adjective
adjective
BrE BrE//ˈmɔːdnt//
 
; NAmE NAmE//ˈmɔːrdnt//
 
(formal) Describing unpleasant traits
 
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critical and unkind, but funny synonym caustic His mordant wit appealed to students. See related entries: Describing unpleasant traits Word Origin late 15th cent.: from French, present participle of mordre ‘to bite’, from Latin mordere.
See the Oxford Advanced American Dictionary entry: mordant