e.g. He has the tenacity to go through the difficult training without giving up.
e.g. I was surprised by the tenacity of her grip, since I couldn't loosen her hands form my arm.
e.g. The tenacity of these questions through the history of the subject suggests that their answers are very important.
"The most difficult thing is the decision to act; the rest is merely tenacity." -- Amelia Mary Earhart
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