Definition of passive-aggressive adjective from the Oxford Advanced Learner's Dictionary

 

passive-aggressive

 adjective
adjective
BrE
 
; NAmE
 
 
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being angry without expressing your anger openly, but resisting people in authority by refusing to do what they want or to accept responsibility for your actions He exhibited passive-aggressive tendencies. Passive-aggressive behaviour often stems from repressed anger.
See the Oxford Advanced American Dictionary entry: passive-aggressive