英汉解释

adj. 轻率的；欠考虑的；考虑不周的；不顾及他人的

同义词

a. heedless，uncaring，unheeding，unthinking

反义词

a.   attentive，heedful，paying attention，thoughtful

参考例句

1. She forgave him his thoughtless remark.
她原谅了他说的轻率的话。
2. Carol: Mike, sometimes you can be so thoughtless in what you say.
卡罗尔：迈克，你说话的时候，请你用用脑子好吗？
3. Nouns that describe someone or a behavior that is stupid and thoughtless.
名词，用以描述某人或是某种行为很是笨拙，欠思量。

英英解释

adj.
  1. showing lack of careful thought
  2. marked by or paying little heed or attention
  3. without care or thought for others

网络释义

thoughtless
欠考虑的; 无思想的; 不注意的; 轻率;
T Thoughtless
吉他摇滚; 迷幻摇滚;
be thoughtless of
不考虑;
Of thoughtless youth
那样观望自然; 而是时时听到;
careless and thoughtless people
粗心的和欠考虑的人们;