testing[adjective]Synonyms: difficult, arduous, challenging, demanding, exacting, rigorous, searching, strenuous, taxing, tough
[TahlilGaran] English Synonym Dictionary ▲
test‧ing /ˈtestɪŋ/
adjective a testing situation, experience etc is difficult to deal with:
It’s been a testing time. [TahlilGaran] Dictionary of Contemporary English ▲