time-honoured
adjective [ before noun ] UK (US time-honored) uk/ˈtaɪmˌɒn.əd/ us/ˈtaɪmˌɑː.nɚd/
（传统、习俗、方法）古老而又受尊重的，历史悠久的
A time-honoured tradition, practice, or method is respected because it has been done or used in the same way for many years.
humorous The developers dealt with the problem in the time-honoured fashion/way, burying the industrial waste in landfill sites. 开发商处理这个问题用的是老法子——把工业垃圾填埋起来。