形容詞 heedless:

1. marked by or paying little heed or attention
   同義詞：thoughtless, unheeding
2. characterized by careless unconcern
   同義詞：reckless

1. Heedless of consequences; carefree.
   隨心所欲的不顧及后果的; 無拘無束的
2. Deep in thought and heedless of present circumstances or activities; preoccupied.
   心不在焉的，茫然的陷入沉思且未注意到周圍的情況或活動的; 出神的
3. He is heedless of the noises out of the windows.
   他沒有注意到窗外的嘈雜聲。
4. We were heedless of danger in the condition.
   我們在那種條件下忽視了危險。

heed.less

adj.（形容詞）
Marked by or paying little heed; unmindful or thoughtless.See Synonyms at careless See Synonyms at impetuous
不加注意的，掉以輕心的；缺少考慮的，不留神的參見 careless參見 impetuous

【引伸】
heed.lessly
adv.（副詞）
heed.lessness
n.（名詞）