| affirmable | (adjective) capable of being affirmed or asserted | Synonyms: assertable |
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| affirmative | (adjective) affirming or giving assent | Synonyms: affirmatory |
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| (adjective) expressing or manifesting praise or approval | Synonyms: approbative, approbatory, approving, plausive |
| (adjective) expecting the best | Synonyms: optimistic |
| affirmatory | (adjective) affirming or giving assent | Synonyms: affirmative |
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| afire | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, aflame, aflare, alight, on fire |
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| confirmable | (adjective) capable of being tested (verified or falsified) by experiment or observation | Synonyms: falsifiable, verifiable |
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| confirmative | (adjective) serving to support or corroborate | Synonyms: collateral, confirmatory, confirming, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verificatory, verifying |
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| confirmatory | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirming, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verificatory, verifying |
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| confirmed | (adjective) having been established or made firm or received the rite of confirmation | - |
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| (adjective) of persons; not subject to change | - |
| confirming | (adjective) indicating existence or presence of a suspected condition or pathogen | Synonyms: positive |
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| (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verificatory, verifying |
| disconfirming | (adjective) not indicating the presence of microorganisms or disease or a specific condition | Synonyms: negative |
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| (adjective) establishing as invalid or untrue | Synonyms: invalidating |
| fired | (adjective) having lost your job | Synonyms: discharged, dismissed, laid-off, pink-slipped |
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| fireproof | (adjective) impervious to damage by fire | - |
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| firm | (adjective) unwavering in devotion to friend or vow or cause | Synonyms: fast, loyal, truehearted |
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| (adjective) securely fixed in place | Synonyms: fast, immobile |
| (adjective) strong and sure | Synonyms: strong |
| (adjective) not soft or yielding to pressure | Synonyms: solid |
| (adjective) possessing the tone and resiliency of healthy tissue | - |
| (adjective) marked by firm determination or resolution; not shakable | Synonyms: steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering |
| (adjective) securely established | - |
| (adjective) not subject to revision or change | - |
| (adjective) (of especially a person's physical features) not shaking or trembling | - |
| (adjective) not liable to fluctuate or especially to fall | Synonyms: steady, unfluctuating |
| firmamental | (adjective) relating to the firmament or upper regions | - |
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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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| infirm | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, decrepit, feeble, rickety, sapless, weak, weakly |
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| (adjective) lacking firmness of will or character or purpose | - |
| unconfirmed | (adjective) not finally established or settled | - |
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| unfirm | (adjective) (of soil) unstable | Synonyms: shifting |
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| (adjective) not firmly or solidly positioned | Synonyms: unsteady |