heedless

1. ADJ If you are heedless of someone or something, you do not take any notice of them. 不注意的; 掉以轻心的[正式] [oft ADJ 'of' n]

Heedless of time or any other consideration, they began to search the underwater cave. 他们根本没考虑时间或任何其他因素就开始寻找水下洞穴了。

She was rummaging through the letters, scattering them about the table in her heedless haste. 她在信件里乱翻，匆匆忙忙不管不顾地扔得满桌都是。