頑固 is the common word for stubbornness. 固陋頑迷 is a much stronger, literary yojijukugo implying not just stubbornness but also narrow-mindedness and poor judgment.
A yojijukugo combining 固陋 (narrow-minded, obstinate) and 頑迷 (stubborn, bigoted). The exact historical derivation is uncertain, but the compound intensifies the sense of stubborn narrow-mindedness.
