Synonym: heedless, uncaring, unheeding, unthinking. Similar words: thoughtfulness, thought, a thought, thoughtful, forethought, deep in thought, at the thought of, though. Meaning: ['θɔːtlɪs] 
adj. 1. showing lack of careful thought 2. marked by or paying little heed or attention 3. without care or thought for others.
adj. 1. showing lack of careful thought 2. marked by or paying little heed or attention 3. without care or thought for others. 
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31 We have caused enough harm by our thoughtless, irresponsible, selfish behaviour.
32 It was thoughtless of Miguel to take the vehicle - but maybe he'd needed it in a hurry.
33 This thoughtless response is so much easier than confronting the real reasons, as it has an inevitability about it.
34 Agricultural subsidies and a thoughtless disregard for natural processes are washing away the commonwealth of land, its soils and wildlife.
35 You are thoughtless in speech and always make trouble.
36 Mr treatment of you was thoughtless, inexcusable!
37 It was just a thoughtless remark.
38 Take care to avoid parties or games where thoughtless revelry and carousing are the norm.
39 Likewise, an unrestrained id would create a pleasure-seeking thoughtless individual[sentencedict.com/thoughtless.html], seeking to fulfill every desire without delay.
40 Thoughtless boy have deface the desk by marking on them.
41 Thoughtless boys have defaced the desks by marking on them.
42 With her sister she was much alone, a lone figure in a tossing, thoughtless sea.
43 It was a favourite for conversation, and for that indolent lounging a gay and thoughtless people.
44 Thoughtful men ought not to be thoughtless about the drought.
45 He was lively, witty, good-natured, and a pleasant companion, but idle, thoughtless, and imprudent to the last degree.
46 When I was 16 I had an abortion, but I carried on being carefree and thoughtless until my mid-thirties, when I met the man of my dreams.
47 She didn't dare to do anything thoughtless, otherwise she would lose her second son.
48 It is thoughtless to go out when it is thundering.
More similar words: thoughtfulness, thought, a thought, thoughtful, forethought, deep in thought, at the thought of, though, although, as though, even though, thorough, ought, throughout, sought, fought, bought, thoroughly, wrought, brought, ought to, drought, tactlessness, lighthouse, limitlessness, through to, overwrought, toughness, witless, artless.