obstinately
🇺🇸
/ˈɑːbstɪnətli/
🇬🇧
/ˈɒbstɪnətli/
Being stubborn and unwilling to change your mind, even when it's clear that you should.
Despite all the evidence, he obstinately insisted on his own theory.
すべての証拠にもかかわらず、彼は自分の理論に固執して主張した。