頑固一徹
gan.ko.i-.ttetsu

Literally: firmly – harden – one – pierce

Alternately: Obstinate. Stubbornly sticking to one’s views or ideas. Pushing one’s vision through in spite of all opposition or resistance. Alternately, a person with that sort of stubbornness.

Notes: Both 頑固 and 一徹 mean “stubborn” on their own, so this is a yojijukugo that emphasizes its content through repetition.

Apparently some people accidentally replace 徹 with homophone 撤 (“removal”) in handwriting; this is an error.

A guy literally named 一徹, from an old baseball manga called 巨人の星 (Star of the Giants). Apparently he’s not just stubborn but also kind of angry and violent.  8^(