形容詞 thoughtless:

1. showing lack of careful thought
2. marked by or paying little heed or attention
   同義詞：heedless, unheeding
3. without care or thought for others
   同義詞：uncaring, unthinking

1. It was very thoughtless of you to keep her waiting so long.
   你讓她等那麼久也太不體諒人了。
2. It was thoughtless if well-meaning.
   用意雖好，考慮欠周。
3. She forgave him his thoughtless remark.
   她原諒了他說的輕率的話。
4. It was thoughtless of you to forget your mother's birthday.
   你太粗心了，居然連你媽媽的生日也忘了。