pertinacious

Meanings

1. 1
   adj

   holding resolutely to an opinion, purpose, or course of action

   Her pertinacious pursuit of the evidence eventually reopened the case.

2. 2
   adj

   stubbornly or annoyingly unwilling to give up or change

   The pertinacious salesman continued calling after several refusals.

From Latin pertinax (stem pertinac-), "very tenacious, persistent," formed from per- ("thoroughly") + tenax ("holding fast"), from tenere ("to hold"). It is therefore etymologically close to tenacious.

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