野放図・野方図・野放途|のほうずnohouzu[2]nakadaka (mid-high)

1. na-adjective, nounwild; unruly; arrogant
2. na-adjective, nounendless (e.g. spending); uncontrolled; rampant (e.g. weeds)

• Synonym傍若無人ぼうじゃくぶじんWrittenWritten four-character idiom for acting as if no one else were there; 「野放図」 also covers uncontrolled spread, as in 「野放図に広がる」.
• RelatedわがままNeutralNeutral and the most general word for being selfish or wilful; it lacks the sense of boundless abandon in 「野放図」.
• Related生意気なまいきCasualColloquial: cheeky and presumptuous, usually said by a superior about a junior; no sense of uncontrolled spread.
• Related勝手かってNeutralNeutral: doing as one pleases, as in 「勝手にする」; stresses acting on one's own authority rather than boundless excess.
• Related身勝手みがってNeutralNeutral: thinking only of one's own convenience, as in 「身勝手な人」; centres on selfishness, not uncontrolled spread.
• Related自分勝手じぶんかってNeutralNeutral but disapproving: selfish and concerned only with oneself; describes individual conduct, not rampant growth.
• Related傲慢無礼ごうまんぶれいWrittenWritten term for arrogant, insolent treatment of others; it does not describe limitless expansion or overgrowth.
• RelatedエゴイスティックNeutralNeutral loanword for egoistic, describing a self-centred mindset; it does not suggest rampant growth.
• Related厚顔こうがんWrittenWritten word for shameless impudence, mostly as 「厚顔無恥」; stresses a thick skin rather than uncontrolled behaviour.
• Related利己的りこてきWrittenWritten: self-serving, focusing on the motives behind actions; carries no nuance of limitlessness.
• Related倨傲きょごうWrittenWritten but rare, with a classical air: haughty and looking down on others; no sense of uncontrolled excess.
• Related鉄面皮てつめんぴWrittenWritten: brazenly thick-skinned and shameless, strongly derogatory; says nothing about scale or spread.
• Related得手勝手えてかってWrittenWritten and rare: doing whatever suits oneself; stresses wilfulness rather than limitless abandon.
• Related我が強いががつよいNeutralNeutral phrase for a stubborn, headstrong character who won't listen to others; no sense of uncontrolled excess.
• Related手前勝手てまえがってWrittenWritten: caring only about one's own convenience, close to 「身勝手」; lacks the nuance of boundless spread.

For wilfulness say 「わがまま」, for selfishness 「自分勝手」. Choose 「野放図」 for behaviour that is utterly uncontrolled or brazenly rampant, as in 「野放図な開発」 or 「野放図に広がる」, and 「傍若無人」 for someone acting as if no one else is there.

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

1. ずうずうしいこと。横柄おうへいなこと。また、そのようなさま。
2. 際限さいげんがないこと。また、そのようなさま。