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

 

cantankerous

 adjective
adjective
BrE BrE//kænˈtæŋkərəs//
 
; NAmE NAmE//kænˈtæŋkərəs//
 
 
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bad-tempered and always complaining a cantankerous old man Word Origin mid 18th cent.: of unknown origin; perhaps a blend of Anglo-Irish cant ‘auction’ and rancorous (see rancour).
See the Oxford Advanced American Dictionary entry: cantankerous