| athirst | (adjective) (usually followed by `for') extremely desirous | Synonyms: hungry, thirsty |
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| bloodthirsty | (adjective) marked by eagerness to resort to violence and bloodshed | Synonyms: bloody-minded, sanguinary |
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| first | (adjective) preceding all others in time or space or degree | Synonyms: 1st |
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| (adjective) highest in pitch or chief among parts or voices or instruments or orchestra sections | - |
| (adjective) ranking above all others | Synonyms: foremost, world-class |
| (adjective) serving to begin | Synonyms: beginning |
| (adjective) serving to set in motion | Synonyms: inaugural, initiative, initiatory, maiden |
| firstborn | (adjective) first in order of birth | Synonyms: eldest |
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| firsthand | (adjective) received directly from a source | - |
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| headfirst | (adjective) with the head foremost | Synonyms: headlong |
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| thirsty | (adjective) feeling a need or desire to drink | - |
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| (adjective) able to take in large quantities of moisture | - |
| (adjective) (usually followed by `for') extremely desirous | Synonyms: athirst, hungry |
| (adjective) needing moisture | - |