反义词是careful，例如：
1.Either choice requires a lot of careful consideration and shouldn't be made lightly.哪种选择都需要认真仔细的考虑，不能轻率地做出决定。
2.It takes careful listening and close observation to sense the message another soul may be sending to our own.这需要仔细的倾听，密切地观察另外一个灵魂可能正在发给我们的心灵呼应。
