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

 

testing

 adjective
adjective
BrE BrE//ˈtestɪŋ//
 
; NAmE NAmE//ˈtestɪŋ//
 
 
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(of a problem or situation) difficult to deal with and needing particular strength or abilities This has been a testing time for us all.
See the Oxford Advanced American Dictionary entry: testing