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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1 Downy lips make thoughtless slips.
2 It was thoughtless of her to mention it.
3 It was thoughtless not to phone and say you'd be late.
4 It was thoughtless of me to do such a thing.
5 It was thoughtless of you to forget your sister's birthday.
6 It was rather thoughtless of him, to say the least.
7 She forgave him his thoughtless remark.
8 Well, really,[www.Sentencedict.com] how thoughtless of him!
9 Her thoughtless remark cut him to the quick.
10 It astonishes me he could be so thoughtless.
11 I wonder why you are so thoughtless of others.
12 Thoughtless boys defaced the gate of the school with rude message in blue paint.
13 The media was criticized for its thoughtless incursion into the domestic grief of the family.
14 It was thoughtless of her not to tell you where she was going.
15 It was thoughtless of you to eat all the cake and leave none for me.
16 How very thoughtless. I'll give him a piece of my mind.
17 Repetition is considered to be deadening, boring(sentencedict.com), thoughtless.
18 One thoughtless comment spoiled the whole evening.
19 It was thoughtless if well meaning.
20 How could she have been so thoughtless, so foolish, done something so unarguably dangerous?
21 Suzie was headstrong, and sometimes thoughtless of other people's feelings.
22 It was thoughtless of him to not send her flowers.
23 She's not intentionally unkind - she's just a little thoughtless sometimes.
24 Even the road to hypoallergenic Kleenex is paved with thoughtless growth, but not quite the way you'd think.
25 She was still angry with Luke - he had been thoughtless, and surprisingly insensitive.
26 Match anglers often complain about bad, or should I say thoughtless, pegging.
27 Many years before that, man has thought of the animal as being stupid and thoughtless.
28 That certainly wasn't the intent, and we're sorry for any hurt this thoughtless headline caused.
29 All the aggravation about replacing by bus pass, credit cards and library cards etc, all because I was thoughtless.
30 But in fact, competition between the two men to produce the first pulp led to hurried, thoughtless design.
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.