| 1. | (satellite adjective) not exhibiting or characterized by careful thought | 
	
	
	 |  | Synonyms: unreflective, unthoughtful | 
        
	
	
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         | 2. | (adverb) in a thoughtless manner; "he stared thoughtlessly at the picture" | 
	
	
	 |  | Synonyms: thoughtlessly, unthinkingly | 
        
	
	
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         | 3. | (satellite adjective) mentally sluggish | 
	
	
	 |  | Synonyms: lumpen, lumpish | 
        
	
	
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         | 4. | (satellite adjective) without care or thought for others; "the thoughtless saying of a great princess on being informed that the people had no bread; `Let them eat cake'" | 
	
	
	 |  | Synonyms: thoughtless, uncaring | 
        
	
	
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