Very well-organized and very persistent.

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I've had cases where men are very persistent and spend a big part of the night bugging you.

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But on the other hand, it would be unreasonable not to use this opportunity in order to -- not to discuss what we've been doing for the recent days or the recent time in a very coordinated and persistent manner.

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That level of development would require "a very high and persistent pace of new field developments", of more than 17 new fields per year over the next 25 years, which would be "a major challenge for the oil and gas supply chain".

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"It's not unusual for a surgeon to have to go back a second time and a third time because these infections -- look at that young lady in Georgia -- can spread in a very determined and rapid and persistent fashion, " Schaffner said.

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Edwin Drake had no obvious qualifications to run the Seneca Oil Company except for two: as a retired railroad conductor, he could travel by train with a free pass, and--in what is required for the head of any start-up--he was very persistent by nature, indeed downright stubborn.

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