This is the 4894th most frequent Russian word.
капитально
Thoroughly; completely; strongly.
In this sentence, 'капитально' indicates that the repair was complete and thorough, emphasizing the extent and quality of the repair.
Эта машина была капитально отремонтирована.
This car was thoroughly repaired.
Here, 'капитально' describes the extent of studying, implying a thorough and exhaustive approach.
Он капитально изучил этот материал перед экзаменом.
He thoroughly studied this material before the exam.
In this case, 'капитально' relates to the depth and detail of the discussion.