na-adjective, noun
stubbornly conservative; narrow-minded; averse to new things
Describes a person or attitude that stubbornly clings to old ways and resists change. Often used in formal or critical contexts.
彼の考え方は固陋で、新しい提案を全く受け入れない。
His way of thinking is stubbornly conservative; he won't accept any new proposals at all.
固陋な態度では時代の変化についていけない。
With a narrow-minded attitude, you can't keep up with the changing times.
From the kanji 固 (firm, stubborn) and 陋 (narrow, mean). The combination conveys a stubborn narrow-mindedness.