fruitless trial

See: mistrial
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The 20-year-old Togo international was rejected by Dick Advocaat after a spell at Ibrox earlier this year and also had a fruitless trial with Fulham as he sought a move to British football.
Who had fruitless trials at West Brom, Manchester City and Newcastle United?
Another approach, by such companies as Pharsight, is to employ high-performance computers to run a diverse slate of virtual clinical trials in order to avoid fruitless trials.