painstaking

painstaking

adjective.  with great care and effort, meticulous

"The death penalty trial of accused Boston Marathon bomber Dzhokhar Tsarnaev -- long delayed by painstaking jury selection, crippling snowstorms and last-ditch appeals to move the case to someplace else -- finally is scheduled to begin here next week."
"Rescue efforts are painstaking and slow, and only take place during daylight hours."
"The book describes the election process in painstaking detail."

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