na-adjective
old-fashioned sentimental; in the style of naniwa-bushi
Describes something reminiscent of naniwa-bushi, a traditional narrative ballad style, often implying a sentimental, moralistic tone centered on duty and compassion. Used figuratively for attitudes or stories that feel old-fashioned or overly emotional.
See also: 浪花節
彼の考え方は浪花節的で、義理と人情を重んじる。
His way of thinking is old-fashioned and sentimental, valuing duty and compassion.
浪花節 is the noun for the ballad genre itself, while 浪花節的 is the adjectival form describing something as being in that style or spirit.
From 浪花節 (naniwa-bushi, a traditional narrative ballad) + 的 (-teki, adjectival suffix). The exact historical derivation of the ballad name is uncertain, but it is associated with the old name for Osaka (浪花).