| erst | (adverb) at a previous time | Synonyms: at one time, erstwhile, formerly, once |
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| erstwhile | (adverb) at a previous time | Synonyms: at one time, erst, formerly, once |
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| feetfirst | (adverb) with the feet foremost | - |
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| first | (adverb) before anything else | Synonyms: first of all, first off, firstly, foremost |
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| (adverb) prominently forward | Synonyms: foremost |
| (adverb) the initial time | - |
| (adverb) before another in time, space, or importance | - |
| firsthand | (adverb) from the original source; directly | Synonyms: at first hand |
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| firstly | (adverb) before anything else | Synonyms: first, first of all, first off, foremost |
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| headfirst | (adverb) with the head before the body | Synonyms: headlong |
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| superstitiously | (adverb) in a superstitious manner | - |
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| thirstily | (adverb) in a thirsty manner | - |
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| (adverb) with eagerness; in an eager manner | Synonyms: eagerly |
| understandably | (adverb) in an intelligible manner | Synonyms: clearly, intelligibly |
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| understandingly | (adverb) with understanding | - |
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| ununderstandably | (adverb) in an unintelligible manner | Synonyms: unintelligibly |
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| worst | (adverb) to the highest degree of inferiority or badness | - |
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