Algot
pertinacious
/ˌpəːtɪˈneɪʃəs/
adjective
formal
Holding firmly to an opinion or a course of action.
Origin
Early 17th century from Latin pertinax, pertinac- ‘holding fast’ + -ous.
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Francis is well-known for pertinacious adherence to routine and detail.
(FYI - I am not Francis.)
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