You are already an adult. You can't act arbitrarily and recklessly anymore.
Examples (Wiktionary)
Mandarin
任意竞赛图都有一个王。
任意競賽圖都有一個王。
rèn yì jìng sài tú dōu yǒu yī ge wáng .
In every tournament there exists a king.
Mandarin
这条路三天两头的挖,坑坑洞洞的,真是寸步难行。政府种种严谨的法律,使得不肖的生意人,大叹寸步难行,再也不能任意剥削了。
這條路三天兩頭的挖,坑坑洞洞的,真是寸步難行。政府種種嚴謹的法律,使得不肖的生意人,大嘆寸步難行,再也不能任意剝削了。
zhè tiáo lù sān tiān liǎng tóu de wā , kēng kēng dòng dòng de , zhēn shì cùn bù nán xíng . Zhèngfǔ zhǒng zhǒng yán jǐn de fǎ lǜ , shǐ dé bù xiào de shēng yì rén , dà tàn cùn bù nán xíng , zài yě bù néng rèn yì bō xuē le .
They have been digging up this road for the last several days and it is full of potholes. It is really difficult to move forward. All kinds of strict government laws make it so that unscrupulous business people lament the fact that it is difficult for them to make headway. They can no longer prey on people at will