Terror made me cruel; and, finding it useless to attempt shaking the creature off, I pulled its wrist on to the broken pane, and rubbed it to and fro till the blood ran down and soaked the bedclothes: still it wailed, ’Let me in!’ and maintained its tenacious gripe, almost maddening me with fear.
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She is as tenacious as a bulldog.
a mind not gifted to discover truth but tenacious to hold it