How to say "deep-seated" in Japanese

• 根強いねづよいCommon
  i-adjectiveCovers 'deep-seated' in the sense of 'firmly rooted': feelings such as distrust or opposition that stay strong and show no sign of fading. The common choice for such persistent attitudes.
  その州しゅうでは未いまだに古ふるい慣習かんしゅうが根強ねづよい、とその文化ぶんか人類学じんるいがく者しゃは言いっている。↗

  The anthropologist says old customs still prevail in the province.
• 根が深いねがふかい
  expression, i-adjectiveAlso 'deep-seated', picturing roots that reach deep: problems, prejudice, or habits so entrenched that they resist solution or change. Less common than 根強い, but natural when stressing how hard something is to uproot.

Both translate 'deep-seated' for feelings, attitudes, and problems that are hard to get rid of: prefer the common 「根強い」 for something that stays strong without fading, and 「根が深い」 to stress deep, hard-to-solve entrenchment.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 根強いねづよいfirmly rooted
• 根が深いねがふかいdeep-seated