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

 

problem

 adjective
adjective
BrE BrE//ˈprɒbləm//
 
; NAmE NAmE//ˈprɑːbləm//
 
 
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[only before noun] causing problems for other people She was a problem child, always in trouble with the police. Word Origin late Middle English (originally denoting a riddle or a question for academic discussion): from Old French probleme, via Latin from Greek problēma, from proballein ‘put forth’, from pro ‘before’ + ballein ‘to throw’.
See the Oxford Advanced American Dictionary entry: problem