| thoughtful | (adjective) exhibiting or characterized by careful thought | - |
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| (adjective) taking heed; giving close and thoughtful attention | Synonyms: attentive, heedful, paying attention |
| (adjective) considerate of the feelings or well-being of others | - |
| (adjective) having intellectual depth | - |
| (adjective) characterized by solemn, sincere manner | Synonyms: serious-minded |
| thoughtless | (adjective) showing lack of careful thought | - |
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| (adjective) without care or thought for others | Synonyms: uncaring, unthinking |
| thousand | (adjective) denoting a quantity consisting of 1,000 items or units | Synonyms: 1000, k, m, one thousand |
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| thousandth | (adjective) the ordinal number of one thousand in counting order | Synonyms: 1000th |
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