| affirmatively | (adverb) in an affirmative manner | - |
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| feetfirst | (adverb) with the feet foremost | - |
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| firm | (adverb) with resolute determination | Synonyms: firmly, steadfastly, unwaveringly |
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| firmly | (adverb) with firmness | Synonyms: hard |
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| (adverb) with resolute determination | Synonyms: firm, steadfastly, unwaveringly |
| (adverb) in a secure manner; in a manner free from danger | Synonyms: securely |
| 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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