pertinacious

If you won’t take no for an answer, you’re pertinacious. The same holds true if you stubbornly push on a door despite a sign that says “pull.” Pertinacious means unyielding or perversely persistent.

We get pertinacious from the Latin pertinax, which combines per-, "thoroughly," with tenax, "tenacious." You can impress your friends by dropping pertinacious into conversation when referring to anyone who is bullheaded and obstinately stuck in their ways and opinions. If a Girl Scout is a pertinacious salesperson you might buy fifty boxes of Thin Mints when you only wanted one.

Definitions of pertinacious
  1. adjective
    stubbornly unyielding
    “the most vocal and pertinacious of all the critics”
    synonyms: dogged, dour, persistent, tenacious, unyielding
    obstinate, stubborn, unregenerate
    tenaciously unwilling or marked by tenacious unwillingness to yield
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