pertinacious

/pur-tih-NAY-shus/adjective

holding stubbornly to an opinion or course of action

A pertinacious lobbyist can outlast any news cycle.
Synonyms
stubborn, obstinate, dogged
Antonyms
tractable, yielding
Root
ten- (hold)
Memory hook
per (thoroughly) + ten (hold): holding through everything.

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