| chaetognathan | (adjective) of or relating to arrowworms | Synonyms: chaetognathous |
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| firsthand | (adjective) received directly from a source | - |
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| shorthand | (adjective) written in abbreviated or symbolic form | - |
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| thankful | (adjective) feeling or showing gratitude | Synonyms: grateful |
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| thankless | (adjective) not feeling or showing gratitude | Synonyms: ungrateful, unthankful |
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| (adjective) not likely to be rewarded | Synonyms: unappreciated, ungratifying |
| unthankful | (adjective) not feeling or showing gratitude | Synonyms: thankless, ungrateful |
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